FRS32910

In alog_81849 Sheila and Camilla found a bug in the picomotor controller code, whereby if the motor to be controlled is changed while the controller is busy with the current move command, the motor change is not accepted resulting in the wrong motor being driven during subsequent commands.

As a quick work around until such time as the code can be fixed, I've made a change to the MEDMs which hides the motor selection buttons when the controller is busy.

Attached screenshots show a test case, left shows the normal situation where the controller is not busy and the selection buttons are all visible. The right screen shows a simulation of the controller being busy (INUSE=1), the selection buttons are replaced by rectangular blocks.