XAS-5 add some space into the 'start queue' button text so that when it
switched to 'pause queue' the buttons are not adjusted too far.

This is a problem with XAS client where extra buttons are added to the
toolbar and they are pushed out of line when the queu is started.
Merge branch '8.26' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-core.git into 8.26
Make exception when reading from hdf file more useful
Export  gda.device.detector.nxdetector.plugin
8.26 - Implement swing client watch command in RCP client. BLX-24
MXGDA-779 add check for whether an object is large enough to draw
8.26 - Fix misleading documentation for ScannableMotionBase tolerance. BLX-33
Merge branch '8.26' into 8.26-I10
Merge branch '8.26-I10'