Change attachment handling to remove object from the scene first as per

justincc's original work. Sample scripts before doing so. Also refactor some
crucial common code and eliminate parameters that were only ever used with
the same constant value.

OpenSim/Region/Framework/Interfaces/IAttachmentsModule.cs

@@ -65,7 +65,7 @@ namespace OpenSim.Region.Framework.Interfaces
         /// <param name="sp">The presence closing</param>
         /// <param name="saveChanged">Save changed attachments.</param>
         /// <param name="saveAllScripted">Save attachments with scripts even if they haven't changed.</para>
-        void DeRezAttachments(IScenePresence sp, bool saveChanged, bool saveAllScripted);
+        void DeRezAttachments(IScenePresence sp);
 
         /// <summary>
         /// Delete all the presence's attachments from the scene

OpenSim/Region/Framework/Interfaces/IScenePresence.cs

@@ -40,6 +40,8 @@ namespace OpenSim.Region.Framework.Interfaces
     /// </remarks>
     public interface IScenePresence : ISceneAgent
     {
+        PresenceType PresenceType { get; }
+
         /// <summary>
         /// Copy of the script states while the agent is in transit. This state may
         /// need to be placed back in case of transfer fail.
@@ -83,4 +85,4 @@ namespace OpenSim.Region.Framework.Interfaces
         void RemoveAttachment(SceneObjectGroup gobj);
         void ClearAttachments();
     }
-}
+}