worklist/hifi — pull request #699 by ZappoMan (2013-07-17 18:55:34+00:00)
Title: Fix crashing bug in voxel-server related to animation 

- added VoxelNodeDeleteHook mechanism that allows users of VoxelNode to register for delete notification call backs
- added call back to VoxelNodeBag to remove and nodes from bags when the nodes get deleted
- removed bogus code from VoxelTree that attempted to protect against this case, since it's no longer needed