Mantis#1543. Thank you kindly, Jonc for a patch that:

Implements terrain bake from Region/Estate dialog and 
respects estate settings during terraforming

OpenSim/Region/Examples/SimpleModule/MyNpcCharacter.cs

@@ -57,6 +57,7 @@ namespace OpenSim.Region.Examples.SimpleModule
         public event TextureRequest OnRequestTexture;
         public event RezObject OnRezObject;
         public event ModifyTerrain OnModifyTerrain;
+        public event BakeTerrain OnBakeTerrain;
         public event SetAppearance OnSetAppearance;
         public event AvatarNowWearing OnAvatarNowWearing;
         public event RezSingleAttachmentFromInv OnRezSingleAttachmentFromInv;