Fixed a small bug that generated a wrong country code for Sierra Leone.
Merge pull request #20 from wolfer7/regions_bug

Fixed a small bug that generated a wrong country code for Sierra Leone.
[RefData][UNWTO] Made the AWK code a little bit more robust.
[RefData][ORI] De-duplicated 10 important POR.
Update ori_airlines.csv

Updated LE (Laparkan Airways, Inc.)
Added ICAO code for Tibet Airlines
[RefData][ORI]Updated airline reference for 9T/ABS
[RefData][ORI] Integrated the last updates of Geonames; 50 POR have been updated.
start filling in ori_airline_best_known_so_far.csv
[RefData][ORI] corrected a few airline names/code; added a field indicating type(cargo, scheduled pax, charter, etc)
[RefData][ORI] Integrated the last updates of Geonames; 17 POR have been updated.
[RefData][ORI] correct some more airline codes & names
Merge branch 'trunk' of https://github.com/opentraveldata/optd into trunk
[RefData][ORI] Integrated the last updates of Geonames; 5 POR have been updated.
[RefData][ORI] correct some more airline codes & names
Merge branch 'trunk' of https://github.com/opentraveldata/optd into trunk
[RefData][ORI] Updated the PageRank values for the POR (points of reference).
[RefData][ORI] Updated the airline frequencies.
[RefData][ORI] Updated a few airline details (mainly, sorted slightly differently a few lines).
[RefData][ORI] Fixed the details of VHZ/Vahitahi, Tuamotu, French Polynesia (PF).