check in working migration code fore SQLite. This

is now using migrations instead of the old model to
create tables.  Tested for existing old tables, 
and for creating new ones.

OpenSim/Data/Migration.cs

@@ -159,7 +159,13 @@ namespace OpenSim.Data
         public int Version 
         {
             get { return FindVersion(_type); }
-            set { UpdateVersion(_type, value); }
+            set { 
+                if (Version < 1) {
+                    InsertVersion(_type, value);
+                } else {
+                    UpdateVersion(_type, value);
+                } 
+            }
         }
 
         private int FindVersion(string type)