TECS-WIP : Changed default damping gain
Default damping gain was changed from 0.0 to 0.5. Results from flight testing indicated that baro delays were larger than modelled, requiring some damping gain. This default value will be refined with further flight testing on a range of models.
Merge branch 'TECS-WIP' of github.com:priseborough/ardupilot into TECS-WIP

* 'TECS-WIP' of github.com:priseborough/ardupilot:
  PX4 : Dirty hack to fix channel order difference when using SPektrum radio via S-BUS