[GIT PULL] New ab/i18n series and builtin fixes

This is a pull request for an updated ab/i18n and the builtin.h changes. I can also send this to list on request, but it's 25 patches for what are trivial merge changes and a doc patch.

I've rebased the ab/i18n series on top of master. Now it looks like this:

    master
    \
     use-builtin-h-for-builtin-commands-v2
     \
      ab/i18n

The changes are:

use-builtin-h-for-builtin-commands-v2: (needed by the new ab/i18n series, and a good idea in general)

 833c9cf builtin: use builtin.h for all builtin commands
 http://github.com/avar/git/commit/833c9cf

 git://github.com/avar/git.git use-builtin-h-for-builtin-commands-v2

  * I changed the "builtin: use builtin.h for all builtin commands"
    patch so that it adds builtin.h but only removes cache.h, not
    commit.h and notes.h.

ab/i18n: (new ab/i18n to replace the one in git.git)

 git://github.com/avar/git.git ab/i18n

 1c7584b gettext: Add po/README file documenting Git's gettext

This is new, a README file describing how to deal with the po/ directory. See http://github.com/avar/git/raw/ab/i18n/po/README

 aba2acf gettext tests: remove old sanity test under NO_GETTEXT
 340b167 gettext tests: test message re-encoding under C
 f072e35 po/pl.po: add Polish translation
 ea9736b po/is.po: add Icelandic translation
 a0dfa7e po/is.po: msgmerge and add Language: header
 6693d50 gettext tests: mark a test message as not needing translation
 9428b0a gettext tests: test re-encoding with a UTF-8 msgid under Shell
 b1d6c80 gettext tests: test message re-encoding under Shell
 e630ddd gettext tests: add detection for is_IS.ISO-8859-1 locale
 da615f4 gettext tests: update test/is.po to match t/t0200/test.c
 09c03ba gettext tests: test if $VERSION exists before using it
 56bed97 gettext.c: work around us not using setlocale(LC_CTYPE, "")
 c1c0d12 gettext: localize the main git-init message
 a0b47a5 gettext: make the simple parts of git-init localizable
 4a606ac builtin.h: Include gettext.h
 deb01cf Makefile: use variables and shorter lines for xgettext
 4ecebf5 Makefile: tell xgettext(1) that our source is in UTF-8
 3d9f454 Makefile: provide a --msgid-bugs-address to xgettext(1)
 29446ce Makefile: A variable for options used by xgettext(1) calls
 e25db7d tests: locate i18n lib&data correctly under --valgrind
 d3415a9 gettext: setlocale(LC_CTYPE, "") breaks Git's C function assumptions
 3e25bb6 tests: rename test to work around GNU gettext bug

This is all the same.

 760724f Add infrastructure for translating Git with gettext

Changed perl/Makefile so it doesn't conflict with the version now in master (conflict because of "perl/Makefile: Unset INSTALL_BASE when making perl.mak").

END PULL REQUEST.

What I'm working on, which should not be pulled at this time:

ab/i18n-gettextize: http://github.com/avar/git/compare/ab/i18n...ab/i18n-gettextize

  Updated version of the gettextize series rebased on master. No
  longer needs its own builtin.h patches (since ab/i18n itself now
  depends on it). I'm also fixing some minor issues raised on-list.

  I'm also going to add the aforementioned GETTEXT_POISON
  functionality to ab/i18n to make sure this series is OK.

ab/i18n-add-translations: http://github.com/avar/git/compare/ab/i18n-gettextize...ab/i18n-add-translations

  Adds German and British English translations. More additions welcome.