refs #9440. Multiple scale factor outputs.

Stitch1DMany adapted to give the scale factors for each Stitch1D step.
refs #9440. Update algorithm documentation.
refs #9440. Remove deprecated alg method usage.
refs #9440. Merge in master.

Merge branch 'master' into feature/9440_stitch1d_many

Conflicts:
	Code/Mantid/Framework/PythonInterface/plugins/algorithms/Stitch1DMany.py
Merge branch 'master' into feature/9440_stitch1d_many
Merge remote-tracking branch 'origin/feature/9440_stitch1d_many'