no functional change

Allows increasing or decreasing the deadband size in AltHold, Loiter,
PosHold flight modes

Renamed because this threshold is now used for both compass and velocity
variance.
Also minor reorganisation of ekfcheck but no functional change.

this matches SERIAL2_BAUD

this allows selection of protocol type on telem2. The default is
MAVLink, but can be selected as FrSky protocol

Copter: Add parameter LAND_REPOSITION to enable/disable user input during auto-mode landings and descents

Allows configurable z-axis acceleration when pilot is controlling
altitude

Remove global command_total and command_index parameters

Saves at least 15bytes of RAM

Saves about 90bytes of RAM

Values from 0 ~ 100 control amount of filtering on roll and pitch input.
100 = no filter so crisp feel, 0 = a lot of filtering so very sluggish
response

Motors should be attached to RCOutputs 1 and 2, Flaps should be connected
to RC outputs 3 and 4