Fixed SCI-1250: removed NPE from update plot mode, removed NPE from show
plot view handler, added mute/unmute methods to GUI info manager and its
implementations, fixed initialization of plot view, reduced traffic from
ROI manager and refactored code therein
Fix to http://jira.diamond.ac.uk/browse/SCI-808
Fixed SCI-1250, added check for null region names
Merge branch 'gda-8.32'