Add canopy to flight recorder
Use external engine sounds when canopy is not closed
Add canopy to flight recorder for YASim version
Fix spoilers as speedbrake binding for JSBSim
Fix indicated AoA.

Add indicated alpha to the FDM and change cockpit display so that they refer to the indicated AoA rather than true AoA.

According to ADA101648 p84; the ARI Nose probe is related to true AoA by the following formula:

alpha_true = .8122 alpha_NOSEPROBE + .797deg
Merge branch 'github-master' into flightgear-release