fix move stages so that all stages move at once

They should all be queued before stepping any of them.

Also detent the wait so that it doesn't have to be unnecessarily
repeated
enable stop on ctrl-c

Was disabled because it was hanging and preventing the serial port from
being closed. Now fixed.
create xtheta_scancam.move() and id for scancam

move() takes an xyz point, converts it to x-theta-z and commands the
stage moves.

Also created an id string for scancam_base and member function to
retrieve it
cleaned up variable changes from move to member function