Added artificial A.TERRI feature code to indicate territories that act as top level administrative entities, containing other administrative divisions (e.g. American Samoa) to distinguish them from other territories, such as the Ashmore and Cartier Islands that do not contain children.  Removed IllegalStateException from MatchedLocation when it doesn't find a parent in the specified search results to account for the edge cases where a historical location (e.g. Netherlands Antilles) specifies a "parent" at the same ancestry level as itself.