Bug fixes in:
* The nasty 'object index' bug in MeasureObjectIntensity/MeasureColocalization and a few more
* The Circular Average Filter in Smooth
* Writing in ExportToSpreadsheet when some objects have been filtered
* The Median filter in CorrectIlluminationCalculate
* Hitting 'Cancel' after a bug now actually cancels the run
* You can now pick-and-choose which measurements to run in MeasureColocalization