Mantis #2003 - thank you, SachaMagne, for a patch that implements

the first part of gesture persistence.
----------------------------------------------------------
Attachments no longer vanish on walking crossing. Teleport is still
problematic, but will now be blocked with message "Inconsistent
attachment state" rather than losing the attachment. Detach to be
able to TP in that case.

OpenSim/Region/Environment/Scenes/SceneCommunicationService.cs

@@ -615,6 +615,12 @@ namespace OpenSim.Region.Environment.Scenes
 
                     if (destRegionUp)
                     {
+                        if(!avatar.ValidateAttachments())
+                        {
+                            avatar.ControllingClient.SendTeleportFailed("Inconsistent attachment state");
+                            return;
+                        }
+
                         avatar.Close();
 
                         // Compared to ScenePresence.CrossToNewRegion(), there's no obvious code to handle a teleport