also made dissolve vert bmop use the error api, and put in some code
to report it to the user in the xkey ui code.
Need to make a file in editors/mesh for client code utility functions for
bmesh, like e.g. reporting bmesh errors to the user, handling conversion
more automatically, etc.
- remove Verse support. This will be brought back in The Future (probably jiri + me)
This means 5k lines less in blenkernel.
- fix two small errors for global cleanup, now compiles properly with FFMPEG enabled too.
