Added wrapper for region.frameset(), though method not yet implemented by AST Python wrapper. Updated region.frame to indicate a new copy of the encapsulating frame is returned when called (also removed caching since it won't work). Removed "@property" to reflect this.
Added wrapper for region.frameset(), though method not yet implemented by AST Python wrapper. Updated region.frame to indicate a new copy of the encapsulating frame is returned when called (also removed caching since it won't work). Removed "@property" to reflect this.

demitri/cornish