Conflicts:
	Core/Algorithms/src/GISASSimulation.cpp

ColorMapPlot now has fixed margins to prevent axes rectangle jamping, when switching to another units

ParameterizedItem::onChildPropertyChange signature changed to report pointer of child and its property name

New JobResultsPresenter which helps IntensityDataItem to get OutputData and to convert axes units if necessary

based on contour integral, without apparent singularities.
Validated against old (Rémy/Céline) implementation: agrees,
except for strong deviations near q->0, where the new
implementation is smoother.
The analytical calculations are explained in App. C2 of the manual.
This resolves #1300.