MODIFIED:
REIXSRSXSMCPDataSource to handle arbitrary image sizes

ADDED:
REIXSRSXSMCPDetectorFullView() widget class, a stripped down version of
REIXSRSXSMCPDetectorView that just displays the un-binned memory buffer
with ROI controls

MODIFIED:
REIXSRSXSMCPDetectorView(), adding a button to spawn a dialog containing
a REIXSRSXSMCPDetectorFullView widget.
MODIFIED:
onFullImageButtonClicked() to hide the fullImageDialog if it's already
visible.
Merge pull request #1073 from acquaman/Issue1061

If you guys are happy with this it looks like a good enough start to get moving on with. Cheers, well done.