Merge remote branch 'origin/feature/6932_Ignore_RTDL_Packets'

Re #6932.
Conflicts:
	Code/Mantid/Framework/DataHandling/src/SNSLiveEventDataListener.cpp
Merge remote-tracking branch 'origin/feature/7162_lod_off_splatterplot'
Added a paragraph to the algorithm description. Re #7220.
Merge branch 'feature/7220_update_Fit_wiki' into develop