Start merging Andreas' changes:
* MiG-15bis-set.xml: toggle engine emergency brake with Ctrl+K
instead of Ctrl+R, in order not to interfere with instant replay.
* MiG-15bis.xml (FDM):
- tweak_for_idle_thrust: new, hack to counter the excessive idle
thrust of the engine.
- gear static and rolling friction: adjust.
- Delta_Lift_due_to_alpha_and_mach: correct the table.
- Delta_Lift_due_to_speedbrake: remove.
- Drag_due_to_gear: add drag due to flaps.
- Side_force_due_to_beta,
Pitch_moment_due_to_alpha_and_elevator: adjust.
* Models/Instruments/Airspeedometer/MiG-15bis-Airspeedometer.ac:
rewrite; replace the small and large needles with IAS_Needle (thick)
and TAS_Needle (thin).
* Models/Instruments/Airspeedometer/MiG-15bis-Airspeedometer.xml:
indicate IAS and TAS with the IAS_Needle and TAS_Needle respectively.
