fixes problems when group owned land was abandoned by the land owner or reclaimed by the estate manager or by god.
Beside that this new patch makes it possible, that users can buy land directly for a group, if the buyer has the required permissions.
* Change the PhysicsCollision callback for objects to send full contact point information. This will be used to calculate the collision plane for avatars
* Send the physics engine velocity in terse updates, not the current force being applied to the avatar. This should fix several issues including crouching through the floor and walking through walls
* Changed Util.FireAndForget() to use any of five different methods set with async_call_method in the [Startup] section of OpenSim.ini. Look at the example config for possible values
* Replaced calls to ThreadPool.QueueUserWorkItem() with ThreadPool.UnsafeQueueUserWorkItem() since OpenSim does not use Code Access Security sandboxing
* Initialize the LLClientView prim full update queue to the number of prims in the scene for a big performance boost
* Reordered some comparisons on hot code paths for a minor speed boost
* Removed an unnecessary call to the expensive DateTime.Now function (if you *have* to get the current time as opposed to Environment.TickCount, always use DateTime.UtcNow)
* Don't fire the queue empty callback for the Resend category
* Run the outgoing packet handler thread loop for each client synchronously. It seems like more time was being spent doing the execution asynchronously, and it made deadlocks very difficult to track down
* Rewrote some expensive math in LandObject.cs
* Optimized EntityManager to only lock on operations that need locking, and use TryGetValue() where possible
* Only update the attachment database when an object is attached or detached
* Other small misc. performance improvements
* Removed two redundant parameters from SceneObjectPart
* Changed some code in terse update sending that was meant to work with references to work with value types (since Vector3 and Quaternion are structs)
* Committing a preview of a new method for sending object updates efficiently (all commented out for now)
* Shrinks the largest in-memory object, the LLRAW.HeightmapLookupValue struct (only used for exporting to LLRAW terrain files), to the minimum possible size. This seems to have the odd side effect of cutting the size of the two double[256,256] terrain objects in half. Possibly an alignment optimization?
* Fixes 'Inconsistent Attachment State' when teleporting into another region besides the SW most region slot on a MegaRegion.
* Fixes a host of other unintended attachment border cross edge cases that lead to Inconsistent attachment state.
* Rename the RegionCombinerModuleIndividualForwarder to RegionCombinerIndividualEventForwarder so there's no possibility that mono.addins sees any names similar
* Changed the Destination ID to 0 in the TeleportFinish Event (why did we have it as 3?)
* Added border based trigger teleports
* Fix MakeRootAgent border cross tests for ensuring that the position is inside the region to use the borders to figure out if it's outside the Region
