Pre-reqs:
 X Diff must work
   FileDataDest must work
   Load/Save must work

Other tests:
   glmath
   memutil (local_ptr, local_array, release_ptr, file_closer)
   other filters
   model functions (side effect of diff?)
   undo
   undo manager
   bsptree
   animation
   portability functions
   misc
   model utils
   weld
   mesh
   filter manager
   texture filters
   texture manager
   util
   translation code
   texture scaling

Other functionality:
   Viewport/tool interaction
   tools
   commands
   pluginmgr
   preferences
