use deleteLater to ensure that AvatarVoxelSystem delete is on correct thread
reset environment on domain-server change
remove the planets from the VS environment
Merge pull request #1041 from ZappoMan/keep_local_voxels

Keep local voxels
don't attempt to go to user without domain AND position
Merge pull request #1044 from birarda/data-server

don't goToUser without domain and position
Merge pull request #1043 from birarda/master

fix domain jumping with goToUser, remove planet environments
fix bug with constant avatar kill adds
Merge pull request #1045 from birarda/data-server

fix bug with constant avatar kill/adds
fixed a couple crashes and cleaned up some code