Moved the map tile processing used by the Simian Grid

Frontend into a separate region module. Configuration
settings added to the defaults ini file. Others may find
this useful for pushing map tiles to a separate server.

bin/OpenSimDefaults.ini

@@ -1240,6 +1240,14 @@
     ; Enable media on a prim facilities
     Enabled = true;
 
+;; 
+;; If you are using a simian grid frontend you can enable
+;; this module to upload tile images for the mapping fn
+;;
+[SimianGridMaptiles]
+    Enabled = False
+    MaptileURL = "http://www.mygrid.com/Grid/"
+    RefreshTime = 3600
 
 ;;
 ;; These are defaults that are overwritten below in [Architecture].