* Use position instead of last setpoint
This calculates the target velocities better taking into account disturbances along
the flight route. Previously entry angles and more were calculated assuming the flight path
originates directly from the direction of the previous waypoint. This corrects this assumption
to instead make the direction come from the vehicle location.
* Allow to specify a final speed given a braking distance.
This is to allow planning to not stop at a waypoint, but instead
to reach the waypoint while maintaining a certain velocity
* Updated src/lib/matrix
* Account for speed at target when determining constraints
* Separate constraints into x/y components
* Use setpoint position, not vehicle position
* Fix whitespace, add documentation
Before, the pyserial check would fail before it could check for the
VERSION that the Python 2.7 version contains. This fixes it to check
for the VERSION independently.
Julian Kent