TECS-WIP : Added compensation for additional induced drag in turns.

Also updated default parameter values based on SITL and flight test results.
Also fixed typos in comments
Plane: allow selection of TECS at runtime

set ALT_CONTROL_ALG=2
TECS-WIP : Removed printf and added debug statement
TECS-WIP : Height filtering improvements
TECS-WIP : Added adjustable weight for spdvs height control
TECS-WIP : Added hard limit to pitch demand integrator state