fixed object-collision issue after uncheck phantom-flag

Signed-off-by: Michael Cerquoni <nebadon2025@gmail.com>
Don't re-retrieve sit part in SP.HandleAgentSit() when we already have it.
Revert "Don't re-retrieve sit part in SP.HandleAgentSit() when we already have it."

This reverts commit 2c00b73cd27a7183a5c105b4e2865f11e4a00d98.

Wrong code change
Don't re-retrieve sit part in SP.HandleAgentSit() when we already have it (this time with the right code change)
Pass the correct position to QueryAccess() instead of UUID.Zero (it was wrong in one place)
When preparing a Hypergrid teleport, tell the receiving grid which user is entering the grid.

This can affect which region to use. E.g., returning users may be allowed to enter any region, whereas users from other grids will have to enter a gateway region. Previously per-user decisions were only made later, but by then it's too late to change which region the user enters.
Fixed: during a teleport we always sent the error "The teleport destination could not be found" to the client. This happened on both success and failure.

On successful teleports this error wasn't actually shown to the user. But on failed teleports this error could hide the true cause of the failure. For example, attempting to use a Landmark that's more than 4095 regions away would result in two warnings appearing in the viewer: "Region too far" and "Destination could not be found". The second message hid the first one, so it wasn't obvious to the user what is actually the problem.
Refactored: use Scene.GetAgentHomeURI() to get the Home URI of a user
When sending QueryAccess to a region, also send the user's Home URI
Avoid calling HELO service on malformed URLs. This is in response to an exception reported by danbanner.
Better (amend to previous commit)
Allow invalidating the users cache
Improved error messages when a teleport fails. The viewer's dialog already says "Teleport failed", so adding "Teleport refused" is redundant.
Log when the presence service logs-out all the users in a region
In teleports, pass the source region to the destination (similar to an HTTP referrer)
Fixed: when teleporting between grids, the avatar name wasn't always updated.

When an avatar is in their home grid, their name appears as "First Last". In other grids the name appears as "First.Last @grid.example.com". However, viewers have a bug and they don't always show the new name. We use a trick (changing the Group Title briefly) in order to make the viewers show the new name. This is only done after a Hypergrid teleport.
Allows to sell objects on a parcel of land together with that parcel of land. The objects that are sold together with the parcel of land need to fulfill the following preconditions: owned by the current parcel owner, not set to a group, transferrable. This feature does not work for group owned parcels or land bought by a group.
BulletSim: small tweek to avatar height reduce feet embedded into prims.

This adjustment makes a default, shoeless avatar stand properly on a prim
for the various heights (0% to 100% in the appearance adjustment).
Fix the presence info caching used in llRequestAgentData(), which was completely inoperative.

This means the presence info may be out of date by up to 20 seconds, but this avoids scripts potentially triggering constants requests to user accout and presence info services.
Relates to http://opensimulator.org/mantis/view.php?id=7088 though I fixed in a different way.
Adds regression test for this case.
Actually add the llRequestAgentData() test class for commit 530c86