driver simsem: put "realistic" ranges on the axis of the SEM focus
Fixed button face update on Chamber state change
Added Overview Viewport button
All (2x2) button thumbnail image fix
View button resize (They are wider now)
Viewport Focus fix.

If the layout is returning to the 2x2 view and the viewport that has the focus is not displayed, the top left viewport in the 2x2 view gets the focus then by default.
driver stages: add support for .refenrence on wrapper stages

We need to be able to reference a stage, even if it's wrapped into a CombinedStage or CombinedActuator.

For the CombinedStage, we make sure to keep the slave stage synchronized with the master stage after referencing.
Merge branch 'master' into kimon-MiniCalibration