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