Updating the Reactor mesh from the updated jME branch at SourceForge.
Somehow, it managed to get reverted during the migration to GitHub.
Updating MOOSE check state manager.
The TreeCompositeCheckStateProvider was only used by the MOOSE widgets,
so I replaced it with a new, simplified MOOSETreeCheckStateManager in
the MOOSE widgets bundle. This also allowed me to eliminate some code
from the MOOSETreeCompositeView. This fixes MOOSE bug #27.
Adding a performance improvement for the MOOSE tree check state manager.