- completed PSF convolution, source size convolution, energy dependent efficiency, phase contrast with PSF and source size, with test runs
- phase contrast included for beamscreen and for anisotropicsource
- including comparison with Arfelli phase contrast simulation
Merge branch 'devqt' of https://github.com/tschoonj/xrmc into devqt

Conflicts:
	src/spectrum/spectrum.cpp
- added anisotropicsource/intensityscreen description in the tutorial
- added anisotropicsource/intensityscreen example
- added beamsource/beamscreen description in the tutorial
- added beamsource/beamscreen example
- added phase contrast imaging description in the tutorial
- added phase contrast imaging example
- fixed bug in detector Poisson function
Merge branch 'devqt' of https://github.com/golosio/xrmc into devqt
Added support for NIST compounds

Requires the soon to be released xraylib 2.17.0