Create properties around scale / offset variables.

[gadamc]

The scale and offset parameters off the stage controller need to be changed on the fly by the qt3scan application. Of course, a user of an instance of the PiezoControl class can directly modify the underlying variables. But the proper way to do this to guarantee functionality is to make these accessible as a property and then do checks in the setter function.

nipiezeojenapy/src/nipiezojenapy/controller.py

Line 91 in 4445aef

self.scale_microns_per_volt = tuple([scale_microns_per_volt] * 3)