Distinguish hyphen from minus from dashes.

Most of this patch is to commentary, to distinguish better among
the similar characters hyphen '-', minus sign '−', en dash '–' (used
for ranges), and em dash '—'.  Render ordinary dashes in text as
spaced en dashes, as this gives better-looking results in monospaced
fonts.
* yearistype.sh, zic.c: Reword diagnostics so that they do not use
hyphens as if they were dashes.  Since we are sticking to ASCII in
programs, we can't use proper dashes in diagnostics.

southamerica

@@ -29,7 +29,7 @@
 #	I suggest the use of _Summer time_ instead of the more cumbersome
 #	_daylight-saving time_.  _Summer time_ seems to be in general use
 #	in Europe and South America.
-#	-- E O Cutler, _New York Times_ (1937-02-14), quoted in
+#	— E O Cutler, _New York Times_ (1937-02-14), quoted in
 #	H L Mencken, _The American Language: Supplement I_ (1960), p 466
 #
 # Earlier editions of these tables also used the North American style
@@ -37,18 +37,18 @@
 # "summer time".  Reinaldo Goulart, a São Paulo businessman active in
 # the railroad sector, writes (1999-07-06):
 #	The subject of time zones is currently a matter of discussion/debate in
-#	Brazil.  Let's say that "the Brasilia time" is considered the
-#	"official time" because Brasilia is the capital city.
-#	The other three time zones are called "Brasilia time "minus one" or
+#	Brazil.  Let's say that "the Brasília time" is considered the
+#	"official time" because Brasília is the capital city.
+#	The other three time zones are called "Brasília time "minus one" or
 #	"plus one" or "plus two".  As far as I know there is no such
 #	name/designation as "Eastern Time" or "Central Time".
 # So I invented the following (English-language) abbreviations for now.
 # Corrections are welcome!
 #		std	dst
-#	-2:00	FNT	FNST	Fernando de Noronha
-#	-3:00	BRT	BRST	Brasilia
-#	-4:00	AMT	AMST	Amazon
-#	-5:00	ACT	ACST	Acre
+#	−2:00	FNT	FNST	Fernando de Noronha
+#	−3:00	BRT	BRST	Brasília
+#	−4:00	AMT	AMST	Amazon
+#	−5:00	ACT	ACST	Acre
 
 ###############################################################################
 
@@ -60,7 +60,7 @@
 # Argentina: first Sunday in October to first Sunday in April since 1976.
 # Double Summer time from 1969 to 1974.  Switches at midnight.
 
-# From U. S. Naval Observatory (1988-01-199):
+# From U. S. Naval Observatory (1988-01-19):
 # ARGENTINA           3 H BEHIND   UTC
 
 # From Hernan G. Otero (1995-06-26):
@@ -118,7 +118,7 @@ Rule	Arg	2000	only	-	Mar	3	0:00	0	-
 # From Peter Gradelski via Steffen Thorsen (2000-03-01):
 # We just checked with our São Paulo office and they say the government of
 # Argentina decided not to become one of the countries that go on or off DST.
-# So Buenos Aires should be -3 hours from GMT at all times.
+# So Buenos Aires should be −3 hours from GMT at all times.
 #
 # From Fabián L. Arce Jofré (2000-04-04):
 # The law that claimed DST for Argentina was derogated by President Fernando
@@ -146,7 +146,7 @@ Rule	Arg	2000	only	-	Mar	3	0:00	0	-
 # http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm
 # It remains the vote of the Deputies..., but it will be the same....
 # This kind of things had always been done this way in Argentina.
-# We are still -03:00 all year round in all of the country.
+# We are still −03:00 all year round in all of the country.
 #
 # From Steffen Thorsen (2007-12-21):
 # A user (Leonardo Chaim) reported that Argentina will adopt DST....
@@ -229,7 +229,7 @@ Rule	Arg	2008	only	-	Oct	Sun>=15	0:00	1:00	S
 # Hora de verano para la Republica Argentina (2003-06-08)
 # <http://www.spicasc.net/horvera.html>
 # says that standard time in Argentina from 1894-10-31
-# to 1920-05-01 was -4:16:48.25.  Go with this more-precise value
+# to 1920-05-01 was −4:16:48.25.  Go with this more-precise value
 # over Shanks & Pottenger.
 #
 # From Mariano Absatz (2004-06-05):
@@ -237,16 +237,16 @@ Rule	Arg	2008	only	-	Oct	Sun>=15	0:00	1:00	S
 # http://www.lanacion.com.ar/04/05/27/de_604825.asp
 # http://www.lanacion.com.ar/04/05/28/de_605203.asp
 #
-# The following eight (8) provinces pulled clocks back to UTC-04:00 at
+# The following eight (8) provinces pulled clocks back to UTC−04:00 at
 # midnight Monday May 31st. (that is, the night between 05/31 and 06/01).
-# Apparently, all nine provinces would go back to UTC-03:00 at the same
+# Apparently, all nine provinces would go back to UTC−03:00 at the same
 # time in October 17th.
 #
 # Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz,
 # Tierra del Fuego, Tucumán.
 #
 # From Mariano Absatz (2004-06-14):
-# ... this weekend, the Province of Tucumán decided it'd go back to UTC-03:00
+# ... this weekend, the Province of Tucumán decided it'd go back to UTC−03:00
 # yesterday midnight (that is, at 24:00 Saturday 12th), since the people's
 # annoyance with the change is much higher than the power savings obtained....
 #
@@ -270,8 +270,8 @@ Rule	Arg	2008	only	-	Oct	Sun>=15	0:00	1:00	S
 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf
 #
 # From Mariano Absatz (2004-10-05):
-# San Juan changed from UTC-03:00 to UTC-04:00 at midnight between
-# Sunday, May 30th and Monday, May 31st.  It changed back to UTC-03:00
+# San Juan changed from UTC−03:00 to UTC−04:00 at midnight between
+# Sunday, May 30th and Monday, May 31st.  It changed back to UTC−03:00
 # at midnight between Saturday, July 24th and Sunday, July 25th....
 # http://www.sanjuan.gov.ar/prensa/archivo/000329.html
 # http://www.sanjuan.gov.ar/prensa/archivo/000426.html
@@ -319,9 +319,9 @@ Rule	Arg	2008	only	-	Oct	Sun>=15	0:00	1:00	S
 
 # From Mariano Absatz (2008-01-28):
 # I can confirm that the Province of San Luis (and so far only that
-# province) decided to go back to UTC-3 effective midnight Jan 20th 2008
+# province) decided to go back to UTC−3 effective midnight Jan 20th 2008
 # (that is, Monday 21st at 0:00 is the time the clocks were delayed back
-# 1 hour), and they intend to keep UTC-3 as their timezone all year round
+# 1 hour), and they intend to keep UTC−3 as their timezone all year round
 # (that is, unless they change their mind any minute now).
 #
 # So we'll have to add yet another city to 'southamerica' (I think San
@@ -329,7 +329,7 @@ Rule	Arg	2008	only	-	Oct	Sun>=15	0:00	1:00	S
 # America/Argentina/San_Luis... of course I can't remember if San Luis's
 # history of particular changes goes along with Mendoza or San Juan :-(
 # (I only remember not being able to collect hard facts about San Luis
-# back in 2004, when these provinces changed to UTC-4 for a few days, I
+# back in 2004, when these provinces changed to UTC−4 for a few days, I
 # mailed them personally and never got an answer).
 
 # From Paul Eggert (2008-06-30):
@@ -342,8 +342,8 @@ Rule	Arg	2008	only	-	Oct	Sun>=15	0:00	1:00	S
 
 # From Mariano Absatz (2009-03-13):
 # Yesterday (with our usual 2-day notice) the Province of San Luis
-# decided that next Sunday instead of "staying" @utc-03:00 they will go
-# to utc-04:00 until the second Saturday in October...
+# decided that next Sunday instead of "staying" @utc−03:00 they will go
+# to utc−04:00 until the second Saturday in October...
 #
 # The press release is at
 # http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102
@@ -380,7 +380,7 @@ Rule	Arg	2008	only	-	Oct	Sun>=15	0:00	1:00	S
 # change in 2007/2008, were made according to the Federal Law and Decrees
 # that did so on the 3rd Sunday of October and March.
 #
-# In fact, San Luis actually switched from UTC-4 to UTC-3 last Sunday
+# In fact, San Luis actually switched from UTC−4 to UTC−3 last Sunday
 # (October 11th) at 0:00.
 #
 # So I guess a new set of rules, besides "Arg", must be made and the last
@@ -389,15 +389,15 @@ Rule	Arg	2008	only	-	Oct	Sun>=15	0:00	1:00	S
 # I'm enclosing a patch that does what I say... regretfully, the San Luis
 # timezone must be called "WART/WARST" even when most of the time (like,
 # right now) WARST == ART... that is, since last Sunday, all the country
-# is using UTC-3, but in my patch, San Luis calls it "WARST" and the rest
+# is using UTC−3, but in my patch, San Luis calls it "WARST" and the rest
 # of the country calls it "ART".
 # ...
 
 # From Alexander Krivenyshev (2010-04-09):
 # According to news reports from El Diario de la Republica Province San
-# Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time
-# after April 11, 2010--will continue to have same time as rest of
-# Argentina (UTC-3) (no DST).
+# Luis, Argentina (standard time UTC−04) will keep Daylight Saving Time
+# after April 11, 2010 – will continue to have same time as rest of
+# Argentina (UTC−3) (no DST).
 #
 # Confirmaron la prórroga del huso horario de verano (Spanish)
 # http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9
@@ -406,14 +406,14 @@ Rule	Arg	2008	only	-	Oct	Sun>=15	0:00	1:00	S
 
 # From Mariano Absatz (2010-04-12):
 # yes...I can confirm this...and given that San Luis keeps calling
-# UTC-03:00 "summer time", we should't just let San Luis go back to "Arg"
+# UTC−03:00 "summer time", we should't just let San Luis go back to "Arg"
 # rules...San Luis is still using "Western ARgentina Time" and it got
 # stuck on Summer daylight savings time even though the summer is over.
 
 # From Paul Eggert (2013-09-05):
-# Perhaps San Luis operates on the legal fiction that it is at UTC-4
+# Perhaps San Luis operates on the legal fiction that it is at UTC−4
 # with perpetual summer time, but ordinary usage typically seems to
-# just say it's at UTC-3; see, for example,
+# just say it's at UTC−3; see, for example,
 # <http://es.wikipedia.org/wiki/Hora_oficial_argentina>.
 # We've documented similar situations as being plain changes to
 # standard time, so let's do that here too.  This does not change UTC
@@ -422,7 +422,7 @@ Rule	Arg	2008	only	-	Oct	Sun>=15	0:00	1:00	S
 # setting for time stamps past 2038.
 
 # From Paul Eggert (2013-02-21):
-# Milne says Córdoba time was -4:16:48.2.  Round to the nearest second.
+# Milne says Córdoba time was −4:16:48.2.  Round to the nearest second.
 
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 #
@@ -439,11 +439,11 @@ Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31
 # Chaco (CC), Formosa (FM), Santiago del Estero (SE)
 #
 # Shanks & Pottenger also make the following claims, which we haven't verified:
-# - Formosa switched to -3:00 on 1991-01-07.
-# - Misiones switched to -3:00 on 1990-12-29.
-# - Chaco switched to -3:00 on 1991-01-04.
-# - Santiago del Estero switched to -4:00 on 1991-04-01,
-#   then to -3:00 on 1991-04-26.
+# – Formosa switched to −3:00 on 1991-01-07.
+# – Misiones switched to −3:00 on 1990-12-29.
+# – Chaco switched to −3:00 on 1991-01-04.
+# – Santiago del Estero switched to −4:00 on 1991-04-01,
+#   then to −3:00 on 1991-04-26.
 #
 Zone America/Argentina/Cordoba -4:16:48 - LMT	1894 Oct 31
 			-4:16:48 -	CMT	1920 May
@@ -634,9 +634,9 @@ Zone	America/La_Paz	-4:32:36 -	LMT	1890
 # The earliest issue of the SSIM I have is 2/91.  Each issue from then until
 # 9/95 says that DST is observed only in the ten states I quoted from 9/95,
 # along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
-# (UTC-4)....  The other two time zones given for Brazil are BR3, which is
-# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
-# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
+# (UTC−4)....  The other two time zones given for Brazil are BR3, which is
+# UTC−5, no DST, and applies only in the state of Acre (AC); and BR4, which is
+# UTC−2, and applies to Fernando de Noronha (formerly FN, but I believe it's
 # become part of the state of Pernambuco).  The boundary between BR1 and BR2
 # has never been clearly stated.  They've simply been called East and West.
 # However, some conclusions can be drawn from another IATA manual: the Airline
@@ -704,21 +704,21 @@ Zone	America/La_Paz	-4:32:36 -	LMT	1890
 # https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008
 #
 # As a result of the above Decree I believe the America/Rio_Branco
-# timezone shall be modified from UTC-5 to UTC-4 and a new timezone shall
+# timezone shall be modified from UTC−5 to UTC−4 and a new timezone shall
 # be created to represent the...west side of the Pará State. I
 # suggest this new timezone be called Santarem as the most
 # important/populated city in the affected area.
 #
 # This new timezone would be the same as the Rio_Branco timezone up to
-# the 2008/06/24 change which would be to UTC-3 instead of UTC-4.
+# the 2008/06/24 change which would be to UTC−3 instead of UTC−4.
 
 # From Alex Krivenyshev (2008-06-24):
 # This is a quick reference page for New and Old Brazil Time Zones map.
 # http://www.worldtimezone.com/brazil-time-new-old.php
 #
-# - 4 time zones replaced by 3 time zones-eliminating time zone UTC- 05
-# (state Acre and the part of the Amazonas will be UTC/GMT- 04) - western
-# part of Par state is moving to one timezone UTC- 03 (from UTC -04).
+# – 4 time zones replaced by 3 time zones – eliminating time zone UTC−05
+# (state Acre and the part of the Amazonas will be UTC/GMT−04) – western
+# part of Par state is moving to one timezone UTC−03 (from UTC−04).
 
 # From Paul Eggert (2002-10-10):
 # The official decrees referenced below are mostly taken from
@@ -1112,8 +1112,8 @@ Zone America/Rio_Branco	-4:31:12 -	LMT	1914
 
 # From Jesper Norgaard Welen (2006-10-08):
 # I think that there are some obvious mistakes in the suggested link
-# from Oscar van Vlijmen,... for instance entry 66 says that GMT-4
-# ended 1990-09-12 while entry 67 only begins GMT-3 at 1990-09-15
+# from Oscar van Vlijmen,... for instance entry 66 says that GMT−4
+# ended 1990-09-12 while entry 67 only begins GMT−3 at 1990-09-15
 # (they should have been 1990-09-15 and 1990-09-16 respectively), but
 # anyhow it clears up some doubts too.
 
@@ -1287,8 +1287,8 @@ Zone	America/Bogota	-4:56:16 -	LMT	1884 Mar 13
 #
 # From Paul Eggert (2006-03-22):
 # Shanks & Pottenger say that The Bottom and Philipsburg have been at
-# -4:00 since standard time was introduced on 1912-03-02; and that
-# Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from
+# −4:00 since standard time was introduced on 1912-03-02; and that
+# Kralendijk and Rincon used Kralendijk Mean Time (−4:33:08) from
 # 1912-02-02 to 1965-01-01.  The former is dubious, since S&P also say
 # Saba Island has been like Curaçao.
 # This all predates our 1970 cutoff, though.
@@ -1314,7 +1314,7 @@ Link	America/Curacao	America/Kralendijk	# Caribbean Netherlands
 
 # Ecuador
 #
-# Milne says the Sentral and South American Telegraph Company used -5:24:15.
+# Milne says the Sentral and South American Telegraph Company used −5:24:15.
 #
 # From Paul Eggert (2007-03-04):
 # Apparently Ecuador had a failed experiment with DST in 1992.
@@ -1353,7 +1353,7 @@ Zone Pacific/Galapagos	-5:58:24 -	LMT	1931 # Puerto Baquerizo Moreno
 # "The general rule was that Stanley used daylight saving and the Camp
 # did not. However for various reasons many people in the Camp have
 # started to use daylight saving (known locally as 'Stanley Time')
-# There is no rule as to who uses daylight saving - it is a matter of
+# There is no rule as to who uses daylight saving – it is a matter of
 # personal choice and so it is impossible to draw a map showing who
 # uses it and who does not. Any list would be out of date as soon as
 # it was produced. This year daylight saving ended on April 18/19th
@@ -1389,13 +1389,13 @@ Zone Pacific/Galapagos	-5:58:24 -	LMT	1931 # Puerto Baquerizo Moreno
 # http://www.falklandnews.com/public/story.cfm?get=5914&source=3
 #
 # We have gotten this confirmed by a clerk of the legislative assembly:
-# Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the
-# third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3
+# Normally the clocks revert to Local Mean Time (UTC/GMT −4 hours) on the
+# third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT −3
 # hours) on the first Sunday of September at 0200hrs.
 #
 # IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands
 # will not revert to local mean time, but clocks will remain on Summer
-# time (UTC/GMT - 3 hours) throughout the whole of 2011.  Any long term
+# time (UTC/GMT − 3 hours) throughout the whole of 2011.  Any long term
 # change to local time following the trial period will be notified.
 #
 # From Andrew Newman (2012-02-24)
@@ -1445,14 +1445,14 @@ Zone	America/Guyana	-3:52:40 -	LMT	1915 Mar	# Georgetown
 			-3:45	-	GBGT	1966 May 26 # Br Guiana Time
 			-3:45	-	GYT	1975 Jul 31 # Guyana Time
 			-3:00	-	GYT	1991
-# IATA SSIM (1996-06) says -4:00.  Assume a 1991 switch.
+# IATA SSIM (1996-06) says −4:00.  Assume a 1991 switch.
 			-4:00	-	GYT
 
 # Paraguay
 #
 # From Paul Eggert (2006-03-22):
-# Shanks & Pottenger say that spring transitions are from 01:00 -> 02:00,
-# and autumn transitions are from 00:00 -> 23:00.  Go with pre-1999
+# Shanks & Pottenger say that spring transitions are 01:00 → 02:00,
+# and autumn transitions are 00:00 → 23:00.  Go with pre-1999
 # editions of Shanks, and with the IATA, who say transitions occur at 00:00.
 #
 # From Waldemar Villamayor-Venialbo (2013-09-20):
@@ -1546,7 +1546,7 @@ Zone America/Asuncion	-3:50:40 -	LMT	1890
 #
 # From Evelyn C. Leeper via Mark Brader (2003-10-26)
 # <news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net>:
-# When we were in Peru in 1985-1986, they apparently switched over
+# When we were in Peru in 1985–1986, they apparently switched over
 # sometime between December 29 and January 3 while we were on the Amazon.
 #
 # From Paul Eggert (2006-03-22):
@@ -1621,7 +1621,7 @@ Rule	Uruguay	1936	only	-	Nov	 1	 0:00	0:30	HS
 Rule	Uruguay	1937	1941	-	Mar	lastSun	 0:00	0	-
 # Whitman gives 1937 Oct 3; go with Shanks & Pottenger.
 Rule	Uruguay	1937	1940	-	Oct	lastSun	 0:00	0:30	HS
-# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
+# Whitman gives 1941 Oct 24 – 1942 Mar 27, 1942 Dec 14 – 1943 Apr 13,
 # and 1943 Apr 13 "to present time"; go with Shanks & Pottenger.
 Rule	Uruguay	1941	only	-	Aug	 1	 0:00	0:30	HS
 Rule	Uruguay	1942	only	-	Jan	 1	 0:00	0	-
@@ -1668,7 +1668,7 @@ Rule	Uruguay	2005	only	-	Mar	27	 2:00	0	-
 # From Eduardo Cota (2005-09-27):
 # http://www.presidencia.gub.uy/_Web/decretos/2005/09/CM%20119_09%2009%202005_00001.PDF
 # This means that from 2005-10-09 at 02:00 local time, until 2006-03-12 at
-# 02:00 local time, official time in Uruguay will be at GMT -2.
+# 02:00 local time, official time in Uruguay will be at GMT −2.
 Rule	Uruguay	2005	only	-	Oct	 9	 2:00	1:00	S
 Rule	Uruguay	2006	only	-	Mar	12	 2:00	0	-
 # From Jesper Norgaard Welen (2006-09-06):