Megapatch that fixes/adds: friend offer/deny/accept, friendship termination,

on-/offline updates, calling cards for friends.
This adds methods in the DB layer and changes the MessagingServer, so a full
update (incl. UGAIM) is necessary to get it working. Older regions shouldn't
break, nor should older UGAIM break newer regions, but friends/presence will
only work with all concerned parts (UGAIM, source region and destination
region) at this revision (or later).
I added the DB code for MSSQL, too, but couldn't test that.
BEWARE: May contain bugs.

OpenSim/Region/Application/OpenSimBase.cs

@@ -364,7 +364,8 @@ namespace OpenSim
                 m_commsManager 
                     = new CommunicationsLocal(
                         m_networkServersInfo, m_httpServer, m_assetCache, userService, userService,
-                        inventoryService, backendService, backendService, libraryRootFolder, m_dumpAssetsToFile);  
+                        inventoryService, backendService, backendService, userService,
+                        libraryRootFolder, m_dumpAssetsToFile);  
 
                 // set up XMLRPC handler for client's initial login request message
                 m_httpServer.AddXmlRPCHandler("login_to_simulator", loginService.XmlRpcLoginMethod);