change motor 2 speed in method_2d_quasiphase

Make the motor 2 speed match the speed used in the gui. Right now this
is hardcoded as 6000 (units = fs/s???) which is nasty but should work
for now.
fix motor speed in scan cleanup

Change motors to move to their starting place at the end of the scan a
little faster 6000 fs/s instead of 1700 fs/s (motor 2 buzzes less)