Add i18n support to the GLR skeleton. Partially fix the C++

skeleton; a C++ expert needs to finish this.  Remove debugging
msgids; there's little point to having them translated, since they
can be understood only by someone who can read the
(English-language) source code.

Generate runtime-po/bison-runtime.pot automatically, so that we
don't have to worry about garbage getting in that file.  We'll
make sure after the next official release that old msgids don't
get lost.  See
<http://lists.gnu.org/archive/html/bison-patches/2005-07/msg00119.html>.

* runtime-po/Makefile.in.in, runtime-po/bison-runtime.pot: Remove.
Now auto-generated.
* PACKAGING: Don't claim that Gawk, GCC, Perl use this method yet.
Fix typos in explanations of the runtime file.
* bootstrap: Change gettext keyword from YYI18N to YY_.
Use standard Makefile.in.in in runtime-po, since we'll arrange
for backward-compatible bison-runtime.po files in a different way.
* data/glr.c (YY_): New macro, from yacc.c.
(yyuserAction, yyreportAmbiguity, yyreportSyntaxError, yyparse):
Translate messages intended for users.
(yyreportSyntaxError): Change "virtual memory" to "memory" to match
the wording in the other skeletons.  We don't know that the memory
is virtual.
* data/lalr1.cc (YY_): Renamed from _.  All uses changed.
Use same method that yacc.c uses.
Don't translate debugging messages.
(yy::yyreport_syntax_error): Put in a FIXME for the i18n stuff;
it doesn't work (yet), and requires C++ expertise to fix.
* data/yacc.c (YY_): Renamed from YY18N.  All uses changed.
Move defn to a more logical place, to be consistent with other
skeletons.
Don't translate debugging messages.
Don't assume line numbers fit in unsigned int; use unsigned long fmts.
* doc/bison.texinfo: Mention <libintl.h>.  Change glibc cross reference
to gettext cross reference.  Add indexing terms.  Mention YYENABLE_NLS.
* runtime-po/POTFILES.in: Add data/glr.c, data/lalr1.cc.

doc/bison.texinfo

@@ -1203,7 +1203,9 @@ In some cases the Bison parser file includes system headers, and in
 those cases your code should respect the identifiers reserved by those
 headers.  On some non-@acronym{GNU} hosts, @code{<alloca.h>},
 @code{<stddef.h>}, and @code{<stdlib.h>} are included as needed to
-declare memory allocators and related types.  Other system headers may
+declare memory allocators and related types.  @code{<libintl.h>} is
+included if message translation is in use
+(@pxref{Internationalization}).  Other system headers may
 be included if you define @code{YYDEBUG} to a nonzero value
 (@pxref{Tracing, ,Tracing Your Parser}).
 
@@ -4821,8 +4823,8 @@ A Bison-generated parser can print diagnostics, including error and
 tracing messages.  By default, they appear in English.  However, Bison
 also supports outputting diagnostics in the user's native language.
 To make this work, the user should set the usual environment
-variables.  @xref{Using gettextized software, , User influence on
-@code{gettext}, libc, The GNU C Library Reference Manual}.  For
+variables.  @xref{Users, , The User's View, gettext, GNU
+@code{gettext} utilities}.  For
 example, the shell command @samp{export LC_ALL=fr_CA.UTF-8} might set
 the user's locale to French Canadian using the @acronym{UTF}-8
 encoding.  The exact set of available locales depends on the user's
@@ -4835,6 +4837,7 @@ steps.  Here we assume a package that uses @acronym{GNU} Autoconf and
 
 @enumerate
 @item
+@cindex bison-i18n.m4
 Into the directory containing the @acronym{GNU} Autoconf macros used
 by the package---often called @file{m4}---copy the
 @file{bison-i18n.m4} file installed by Bison under
@@ -4846,11 +4849,16 @@ cp /usr/local/share/aclocal/bison-i18n.m4 m4/bison-i18n.m4
 @end example
 
 @item
+@findex BISON_I18N
+@vindex BISON_LOCALEDIR
+@vindex YYENABLE_NLS
 In the top-level @file{configure.ac}, after the @code{AM_GNU_GETTEXT}
 invocation, add an invocation of @code{BISON_I18N}.  This macro is
 defined in the file @file{bison-i18n.m4} that you copied earlier.  It
 causes @samp{configure} to find the value of the
-@code{BISON_LOCALEDIR} variable.
+@code{BISON_LOCALEDIR} variable, and it defines the source-language
+symbol @code{YYENABLE_NLS} to enable translations in the
+Bison-generated parser.
 
 @item
 In the @code{main} function of your program, designate the directory