Add to powder whilst background is subtracted.  Ultimately we may want to make it an option whether to powder sum the background corrected or not background corrected data, but for now this is a quick hack
Powder patterns need image assembly by default
Tracking down segmentation fault - reported to be in destroyEvent()
Added GUI control in form of some IDL scripts that crawl the output directories and compile data for an interactive table viewer
Updates to cheetahview
Added resolution rings to Cheetahview
Fixed up some inconsistencies in powder pattern creation
Added crystallographer and lithographer resolution rings
Merge branch 'testing' into developer

Conflicts:
	source/cheetah.xcodeproj/project.xcworkspace/xcuserdata/barty.xcuserdatad/UserInterfaceState.xcuserstate
Merge branch 'developer' of github.com:antonbarty/cheetah into developer