Refs #9960 Use monitor index parameter from IDF.
Refs #9960 Update IPF files with monitor index.
Merge branch 'master' into feature/9960_legacy_IDF_reduction

Conflicts:
	Code/Mantid/scripts/Inelastic/msg_reducer.py

Refs #9960
Merge remote-tracking branch 'origin/feature/9960_legacy_IDF_reduction'