Merge remote branch 'origin/feature/7754_cppcheck_vates'

Conflicts:
	Code/Mantid/Vates/VatesAPI/src/vtkSplatterPlotFactory.cpp

Refs #7754.
@peterfpeterson can't do a conflict merge correctly.
Merge remote branch 'origin/feature/7390_remove_checkin_except_py'
MedianDetectorTest no LoadEmptyInstrument. Refs #7707
Merge branch 'feature/7707_NewMedianDetectorTest' into develop