* glib/gstring.[ch] (g_string_set_size): Add function to
        allow setting the length of a string greater than the
        current length (for buffering usage)

        * glib/gstring.[ch]: Expose string->allocated_len, since
        that is useful when using GString simply as a buffer.
        (Renamed from string->alloc)

        * glib/giochannel.[ch] glib/giounix.c glib/giowin32.c:
        Major patch from Hidetoshi Tajima and Ron Steinke
        reworking GIOChannel to have:

         - Buffering
         - Sane and useful error reporting
         - Streaming encoding conversion with iconv
         - Convenience functions to read by lines or
           an entire file.

        Also fix remaining 64 bit cleanliness issues.

        * tests/iochannel-test.c tests/Makefile.am: Test case
        for IO channel streaming conversion. Still needs
        some fixing up.