1999-03-16  Michael Natterer  <mitschel@cs.tu-berlin.de>

        This implements the rest of the unit system (unitrc loading and
        saving and full PDB interface)

        * Makefile.am
        * gimp.1
        * user_install
        * user_install.bat
        * unitrc: new file (default unit database) and some documentation

        * app/Makefile.am
        * app/gimpunit.c
        * app/gimpunit_cmds.h
        * app/unitrc.h: new files enabling the unit database and PDB
        access to the unit system

        * app/app_procs.c: parse and save unitrc
        * app/gimprc.[ch]: enable unit parsing. New function
        init_parse_buffers() to enable unitrc to be loaded before gimprc

        * app/gimage_cmds.[ch]: new PDB procedures which set/return an
        image's unit

        * app/install.c: mention unitrc installation

        * app/xcf.c: new xcf property for user defined units. An image's
        unit is saved ...