refs #9799 Cross references fixed
refs #9799 conflicts with develop

Merge branch 'feature/9799_SphinxDocs' into develop

Conflicts:
	Code/Mantid/Framework/MDAlgorithms/src/ConvertToMDParent.cpp
	Code/Mantid/docs/source/algorithms/GroupDetectors-v2.rst
	Code/Mantid/docs/source/algorithms/OneStepMDEW-v1.rst
	Code/Mantid/docs/source/algorithms/SofQW2-v1.rst
	Code/Mantid/docs/source/algorithms/SofQW3-v1.rst