* Cleaned up code in Terrain, Tree and Map modules.

* Fixed a bug with Terragen loader where it would do bad things on a non 256x256 sized terrain. Now loads the array correctly. 
* Moved MapImageModule.cs to Modules/World/WorldMap
* Changed Location.RegionHandle to use Helpers.GetUlong instead of doing it ourselves.

OpenSim/Framework/Location.cs

@@ -1,4 +1,5 @@
 using System;
+using libsecondlife;
 
 namespace OpenSim.Framework
 {
@@ -22,7 +23,7 @@ namespace OpenSim.Framework
 
         public ulong RegionHandle
         {
-            get { return ((ulong) m_x << 32 & (ulong) m_y); }
+            get { return Helpers.UIntsToLong((uint) m_x, (uint) m_y); }
         }
 
         public int X