Re #7953. Using SetSampleMaterial to clarify things.
Re #7953. Adding more logging and fixing but in absorptionXS get.
Re #7953. Quieting compiler warning.
Re #7953. Changed variable name to reflect actual value.
Re #7953. Made MultScatt... event aware.
Re #7953. Moved implementation from header to source.
Re #7953. Added in progress bar reporting.
Re #7953. Adding unit test for the event case of MultScattCylAbs...

Really easy case to pass. Mostly just confirms that you get an event
workspace back. Since the math is the same between both event and histo
rely on the histogram to keep the calculation correct.
Merge remote-tracking branch 'origin/feature/7953_MultipleScatteringCylinderAbsorption'