Make EET, MET and WET links

Problem reported by Justin Grant in:
https://mm.icann.org/pipermail/tz/2024-May/058934.html
* NEWS: Mention this.
* backward (EET, MET, WET): Now links rather than zones.
(EUbackw): Remove.
* backzone (WET, MET, EET): New backward-compatibility zones.

NEWS

@@ -14,8 +14,11 @@ Unreleased, experimental changes
     (last released in the 1990s) have been moved to 'backward'.
     These names, which for post-1970 timestamps mostly just duplicate
     data of geographical names, were confusing downstream uses.
-    Names moved to 'backward' are now Links to geographical names if
-    there is an exact match since 1970, and remain Zones otherwise.
+    Names moved to 'backward' are now links to geographical names.
+    This affects behavior for TZ='EET' for some pre-1981 timestamps,
+    for TZ='CET' for some pre-1947 timestamps, and for TZ='WET' for
+    some pre-1996 timestamps.  Also, TZ='MET' now behaves like
+    TZ='CET' and so uses the abbreviation "CET" rather than "MET".
     Those needing the previous TZDB behavior, which does not match any
     real-world clocks, can find the old entries in 'backzone'.
     (Problem reported by Justin Grant.)

backward

@@ -61,6 +61,7 @@ Link	America/Whitehorse	Canada/Yukon
 Link	America/Santiago	Chile/Continental
 Link	Pacific/Easter		Chile/EasterIsland
 Link	America/Havana		Cuba
+Link	Europe/Athens		EET
 Link	America/Panama		EST
 Link	America/New_York	EST5EDT
 Link	Africa/Cairo		Egypt
@@ -101,6 +102,7 @@ Link	America/Jamaica		Jamaica
 Link	Asia/Tokyo		Japan
 Link	Pacific/Kwajalein	Kwajalein
 Link	Africa/Tripoli		Libya
+Link	Europe/Brussels		MET
 Link	America/Phoenix		MST
 Link	America/Denver		MST7MDT
 Link	America/Tijuana		Mexico/BajaNorte
@@ -296,6 +298,7 @@ Link	Europe/Kyiv		Europe/Zaporozhye
 Link	Pacific/Kanton		Pacific/Enderbury
 Link	Pacific/Honolulu	Pacific/Johnston
 Link	Pacific/Port_Moresby	Pacific/Yap
+Link	Europe/Lisbon		WET
 
 
 # Alternate names for the same location
@@ -325,24 +328,3 @@ Link	Pacific/Honolulu	HST
 Link	America/Los_Angeles	PST8PDT
 Link	Pacific/Guadalcanal	Pacific/Ponape	#= Pacific/Pohnpei
 Link	Pacific/Port_Moresby	Pacific/Truk	#= Pacific/Chuuk
-
-# These rules are stolen from the 'europe' file.
-# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
-Rule	EUbackw	1977	1980	-	Apr	Sun>=1	 1:00u	1:00	S
-Rule	EUbackw	1977	only	-	Sep	lastSun	 1:00u	0	-
-Rule	EUbackw	1978	only	-	Oct	 1	 1:00u	0	-
-Rule	EUbackw	1979	1995	-	Sep	lastSun	 1:00u	0	-
-Rule	EUbackw	1981	max	-	Mar	lastSun	 1:00u	1:00	S
-Rule	EUbackw	1996	max	-	Oct	lastSun	 1:00u	0	-
-
-# From Paul Eggert (2024-05-22):
-# The following zones pretend that standard time extends backward
-# indefinitely into the past, and so are ahistorical.
-# They are present for backward compatibility with older TZDB versions.
-# They are Zones (instead of being a Link like CET)
-# because they are not equivalent to any current Zone since 1970.
-
-# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
-Zone	WET		0:00	EUbackw	WE%sT
-Zone	MET		1:00	EUbackw	ME%sT
-Zone	EET		2:00	EUbackw	EE%sT

backzone

@@ -1845,7 +1845,10 @@ Zone	MST7MDT		 -7:00	US	M%sT
 Zone	CST6CDT		 -6:00	US	C%sT
 Zone	EST		 -5:00	-	EST
 Zone	EST5EDT		 -5:00	US	E%sT
+Zone	WET		  0:00	EU	WE%sT
 Zone	CET		  1:00	C-Eur	CE%sT
+Zone	MET		  1:00	C-Eur	ME%sT
+Zone	EET		  2:00	EU	EE%sT
 
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