Allow '0compile gui' without an interface; this launches the GUI within an existing build directory.
Allow '0compile gui' without an interface; this launches the GUI within an
existing build directory.


git-svn-id: 5a9471c9c4ebc038b65787f57a556de4c667038a@1233 9f8c893c-44ee-0310-b757-c8ca8341c71e

0install/0compile,0install/0compile,0install/0compile,gfxmonk/0compile,timbertson/0compile,timbertson/0compile,gfxmonk/0compile,dabrahams/0compile,dabrahams/0compile