* Reimplementing Terrain as Region Modules

* New method involves interfaces for
** Terrain Paint Brushes (ie raise brush, lower brush, etc)
** Terrain Flood Brushes (ie raise area, lower area, etc)
** Terrain Effects (ie erosion, etc) [= W.I.P, not committed]
* Provided sample implementation for Raise Paint and Raise Area brushes.

OpenSim/Region/Environment/Modules/Terrain/TerrainModule.cs

@@ -39,6 +39,16 @@ using libsecondlife;
 
 namespace OpenSim.Region.Environment.Modules.Terrain
 {
+    public interface ITerrainPaintableEffect
+    {
+        void PaintEffect(ITerrainChannel map, double x, double y, double strength);
+    }
+
+    public interface ITerrainFloodEffect
+    {
+        void FloodEffect(ITerrainChannel map, Boolean[,] fillArea, double strength);
+    }
+
     /// <summary>
     /// A new version of the old Channel class, simplified
     /// </summary>