Always check reset flags in auto. Only set reset flags to true when required. Do not limit hor/vert setpoint acceleration when setpoints are reset.

This brings support for Distros that use Python3 by default such as
Arch Linux.

Signed-off-by: Roman <bapstroman@gmail.com>

Signed-off-by: Roman <bapstroman@gmail.com>

- do not try to shift the target waypoints when a reset occurs in position
control mode. Just make it lock into the current heading.

Signed-off-by: Roman <bapstroman@gmail.com>

Signed-off-by: Roman <bapstroman@gmail.com>

Signed-off-by: Roman <bapstroman@gmail.com>

Signed-off-by: Roman <bapstroman@gmail.com>

Signed-off-by: Roman <bapstroman@gmail.com>

delta reset

Signed-off-by: Roman <bapstroman@gmail.com>

Signed-off-by: Roman <bapstroman@gmail.com>

Signed-off-by: Roman <bapstroman@gmail.com>

Conflicts:
	msg/vehicle_local_position.msg

If a single sensor is fitted, the calculation is not performed and zero values are published.
If dual IMU's are fitted, the vector length difference between the primary IMU and the second sensor is output for the angular rates and accelerations. The vector difference is low pass filtered before the length is taken.
If three IMU's are fitted, the vector length is calculated for both alternative sensors and and the maximum values output.
Fourth and subsequent IMU's are ignored.