- subsurd level '0' is possible again.
however; it was changed to '1' because convert-to-mesh crashes. the
subsurf code doesnt give a result when level is '0', causing the convert
routines to either crash, or deliver empty mesh...
I added a warning in the convert routine now, and dont do anything then.
- changed all glFlush() in glFinish() in editobject.c, which seems to be
the right magical call to show frontbuffer drawing.