Various changes along with "PID tuning started"

Not much on this side... removed waiting for connection on visualize. Also implemented pausing in visualize. But can't run visualize at the same time as other programs using Radio because both consume the same data stream, so both see only a portion of the stream.

So the visualization would have to be part of test_stabilize in order to graph data from the quadcopter while testing the stabilization (maybe modularize the visualization...!? fair amount of work though...)
Merge branch 'master' of https://github.com/quadcopter5/quadcopter