FlightGear - Flight Simulator FGAddon

Stereo sound file bug fixes for the harrier.

This follows from http://thread.gmane.org/gmane.games.flightgear.devel/77932.
With the introduction of the 3D sound engine, all sound files in FlightGear now
must be mono point sources.

The following original sound files have been preserved by renaming to
*-stereo.wav, as the information content in both stereo channels are similar but
non-identical, and mono versions created by extracting the left channel:
- Sound/guns.wav

Citation II:

Add <aircraft-class> to Livery xml's, to overwrite this value in
.fgfs/Aircraft/Citation.xml, as suggested by Edward:
http://sourceforge.net/p/flightgear/mailman/message/34277797/

Citation II:

change <aircraft-class> from "gate" to "ga" (General Aviation)

757-200: C-32A minor fixes to model xml

Increased compatibility Rembrandt. Update for FG 3.x

Citation II:

fix <aircraft-class> (bizjet -> gate) as documented here:
http://wiki.flightgear.org/Interactive_traffic#A_technical_perspective

Use correct case for liveries directory

Citation II:

fix Luxaviation livery's operator tag to conform to ICAO code: LXA

757-200: updated FDM configs; exterior lighting

Fix inccorect path capitalisation (via patch from bugman )