[Dev] 1. Updated the source code to the newest format
         of the ORI-maintained list of POR.
      2. Added the Geonames-derived feature names (e.g., "nce city"
         now returns the POR for the city of Nice, France).
Merge branch 'trunk' into releases
[Release 0.5.1] Release of version 0.5.1.
[Doc] Bumped the release number for the next time.