po: preserve the previous msgid on change as a hint to translators

[Jaka Kranjc]

msgmerge supports generating special comments when msgids change. They
come handy when updating translations and resolving fuzzy strings,
especially if they are long or just typos were fixed in the original
msgid. By comparing both msgid versions, the translator can quickly
see whether the change affects the translation or not.

Trivial example:
 #: appwiz.rc:28
-msgid "Add/Remove Programs"
+#, fuzzy
+#| msgid "Add/Remove Programs"
+msgid "AddAndOrRemove Programs"
 msgstr "Tilføj/Fjern Programmer"

LP
-- 
To err is humor
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