getbundle: add a ``cg`` boolean argument to control changegroup inclusion The ``getbundle`` function was initially design to return a changegroup bundle. However, bundle2 allows transmitting a wide range of data. Some bundle2 requests may not include a changegroup at all. Before this changeset, the client would request a changegroup for ``heads=[nullid]`` and receive an empty changegroup. We introduce an official boolean parameter, ``cg``, that can be set to false to disable changegroup generation on getbundle. A new bundle2 capability is introduced to let the client know.

wireproto: add a ``boolean`` type for getbundle parameters This will be used to control inclusion of some parts in a bundle2.

i18n: detect UI language without POSIX-style locale variable on Windows (BC) On Windows, it isn't common to set LANG environment variable. This patch makes gettext honor Windows-style UI language [1] if no locale variables are set. Because of this change, LANG=C or HGPLAIN must be set in order to disable translation on non-English Windows. [1]: http://msdn.microsoft.com/en-us/library/dd374098(v=VS.85).aspx