2003-12-27  Manish Singh  <yosh@gimp.org>

        * app/main.c
        * app/plug-in/plug-in-shm.c
        * libgimp/gimp.c: POSIX shared memory tile transport implementation,
        and a little code cleanup of the SysV and Win32 implementations.

        * configure.in: checks for shm_open, default to POSIX shared memory
        transport on OS X.