Solved the split workspaces bug.  Refs #7150.
Merge difference.  Refs #7150.
Remove or relevel debug output.  Refs #7150.
Merge remote branch 'origin/bugfix/7150_split_workspace'

Conflicts:
	Code/Mantid/Framework/PythonInterface/plugins/algorithms/SNSPowderReduction.py

Re #7150.