Stepper test fails when starting on flag transition

[sjkelly]

We noticed that when the stepper flag is close to a transition state on start the test will fail. It is possible the debounce setting might be too high in firmware and not catching the transition.

This is a bug, but we will wait until we improve the flag design. Current resolution is to rotate the flag into the middle of a transition.

[sjkelly]

This is still happening, even with improved flags.

[kakaroto]

We could make the code move the motor step by step until it finds a transition then move a number of 'safe' steps before starting the test to ensure that the flag is never on a transition. What do you think? I could implement that and send a pull request.