Fixes Mantis #3793 . Committing thomax/Snoopy's patch to allow deeding of objects, with changes:

- Set OwnerID = GroupID for deeded objects.
- Close a security loophole that would have allowed a user with deed rights in a group to deed ANY object to that group, even if it's not owned by them and/or not set to that group
- Set LastOwnerID correctly. Handle objects vs. prims correctly.

OpenSim/Data/MSSQL/MSSQLAssetData.cs

@@ -39,7 +39,7 @@ namespace OpenSim.Data.MSSQL
     /// <summary>
     /// A MSSQL Interface for the Asset server
     /// </summary>
-    internal class MSSQLAssetData : AssetDataBase
+    public class MSSQLAssetData : AssetDataBase
     {
         private const string _migrationStore = "AssetStore";