Revert "Removed internal limit 2^20 for lloctree"

This reverts commit 7376c833c70fa8253ca4cd0f2f5fc2ed9bd76f49.
Increased octree limit to 32k. Addresses "4096 bug" in Opensim

Thanks to NickyD for tracking down the cause.

Refereces:

https://jira.secondlife.com/browse/SVC-2941
http://redmine.kokuaviewer.org/issues/465
http://jira.phoenixviewer.com/browse/FIRE-11593
Clear out comment text when saving to solve Issue 1078

Thanks to Zi Ree for this fix
Made max octree range power of two.

Fixes crashes observed in "Forum" region in SL where some
avatars seem to be flying millions of meters up in the air.
Fix some cases where busy and muted were not evaluated properly for automated handling of incoming messages
Avoid infinite recursion crashes with wider octree range
Default all available items to be included in new outfits
Reduce max size of octree root to 2048^2 in an attempt to avoid float errors leading to crashes on very long teleports
Display the current region's grid coordinates in Help->About Singularity
Re initiate spatial partitions in the main region after a long teleport jump.

Also kill objects in the regions we left behind.
Restore max octree range to 1024 * 1024