Update ChangeLog.
NEWS: Mention Scheme scanner change
xgettext: Recognize comment tag prefix

Reported by Jiang Xin in
<http://article.gmane.org/gmane.comp.version-control.git/246462>.
* xgettext.c (remember_a_message): Discard a string prefixed to the comment
tag from all remaining comment lines.
tests: Add test for prefixed comment tag

* xgettext-11: New file.
* Makefile.am (TESTS): Add new test.
configure: require automake >= 1.13

Macro AM_EXTRA_RECURSIVE_TARGETS defined in Automake 1.13.
* configure.ac (AM_INIT_AUTOMAKE): Require Automake 1.13 or later.
Add missing file tests/xgettext-11
NEWS: Mention the prefixed comment-tag change
maint: Update Admin/plans
doc: Talk about generic VCS, not CVS

* gettext.texi (Version Control Issues): Rename from "CVS Issues";
talk about generic issues when using version control systems.
doc: Add tips to maintain PO files in the repository

* gettext.texi (Translations under Version Control): New section.
examples: Don't fail on "make install" when a PO file is missing

* Makefile.am (install-data-local): Don't fail if a PO file does
not exist, but warn user to do "make dist".
xgettext: Make mixed_string_buffer_done always return UTF-8 string
xgettext: Provide a way to interpret string literals lazily

* xgettext.c (extract_ty): New field 'literalstring_parser'.
(current_literalstring_parser): New variable.
(extract_from_file): Set 'current_literalstring_parser'.
(savable_comment_convert_encoding): New function.
(arglist_parser_remember_literal): New function.
(arglist_parser_remember): Call 'arglist_parser_remember_literal'.
(arglist_parser_done): Call literalstring_parser on msgctxt,
msgid, and msgid_plural before calling 'remember_a_message';
convert encoding of msgid_comment.
* x-*.h: Register 'literalstring_parser' through SCANNER_*.
* xgettext.h (enum literalstring_escape_type): New enum.
(struct literalstring_parser): New struct.
(struct partial_call): New fields 'msgctxt_escape',
'msgid_escape', and 'msgid_plural_escape'.
(arglist_parser_remember_literal): New function declaration.
(savable_comment_convert_encoding): New function declaration.
c: Interpret string literals lazily

* x-c.c (P7_EOF, P7_STRING_END, P7_QUOTES, P7_QUOTE, P7_NEWLINE)
(UNICODE, IS_UNICODE, UNICODE_VALUE): Remove.
(phase7_get): Remove.
(phase7_ungetc): Remove.
(phase5_get): Use 'phase3_get' directly to extract string
literals; use 'arglist_parser_remember_literal' instead of
'arglist_parser_remember'.
(literalstring_parse): New function.
(literalstring_c): New variable.
(extract_parenthesized): Remove the
'xgettext_current_source_encoding' setting to prevent encoding
conversion around 'arglist_parser_done'.
* x-c.h (SCANNERS_C): Register 'literalstring_c' as a
literalstring_parser.
(literalstring_c): New variable declaration.
vala: Interpret string literals lazily

* x-vala.c (P7_EOF, P7_STRING_END, P7_QUOTES, P7_QUOTE, P7_NEWLINE)
(UNICODE, IS_UNICODE, UNICODE_VALUE): Remove.
(phase7_getc): Remove.
(phase7_ungetc): Remove.
(phase3_get): Use 'phase2_get' directly to extract string
literals; use 'arglist_parser_remember_literal' instead of
'arglist_parser_remember'.
(literalstring_c): Declare external variable.
(extract_balanced): Remove the
'xgettext_current_source_encoding' setting to prevent encoding
conversion around 'arglist_parser_done'.
(token_ty): New field 'escape'.
* x-vala.h (SCANNERS_VALA): Register 'literalstring_c' as a
literalstring_parser.
msgattrib: Add --empty option
NEWS: Mention msgattrib --empty
man: Don't depend on the binary executable
Update after Gnulib changed.
tests: Fix file modes