Fixed bug switching robots...

Fixed bug: If you disable the control panel, switch to a disconnect robot, and
switch back to the original robot, joint signals are re-enabled even though the
control panel is still inactive.
The "move motors" groupbox now correctly disables
Disconnect/connect to robot works sortof...

only if control panel is disabled
Disconnecting and reconnecting now seem to work
Moving robots up and down seem to work
Removing robots from list works
Getting robot info seems to work
Merge branch 'f/fixConnectRobot' into develop