Moves all selected brushes into the selected entity.
Usage:
- Select brush from entity
- Hit Ctrl-Alt-E
- Select some other brush
- Regroup
The other brush will get added to the entity.
- Select brush from entity
- Regroup
The brush will get removed from the entity, and moved to worldspawn.
git-svn-id: svn://svn.icculus.org/netradiant/trunk@147 61c419a2-8eb2-4b30-bcec-8cead039b335
