This is v0.4.0!

Many changes and new routines added!

All arc angles are now stored as 0 to 180 degrees.
All error codes are >= 3000 now.

NEW routines: servoPulseAdjustmentUS(), degreesToPulseUS(),
	and pulseToDegrees(), nextValidPositionDegrees()

Modified moveServoPw(), moveServoDegrees(), and scanArea()
	to use the new routines.

Much testing is needed!