* plug-ins/plugin-helper/*: prototype for an extension that allows
        gmodules as plugins.  Known bug: crashes on gmodules with a static "query" function

        * app/tools/tool.c
        * app/tools/tool.h: created new GimpTool object.  Did away with ToolInfo.
        Most tools still need to be ported over to the new api.
        * plug-ins/script-fu/script-fu-scripts.c: fixed typo in comment.  Pathetic, huh?