Refs #7860 Move existing code into python algorithm.
Refs #7860 Modify algorithm to just take a workspace as input.

Also do some light refactoring at the same time.
Refs #7860 Refactor code with numpy and slicing.
Refs #7860 Fix PEP8 warnings.
Refs #7860 Further refactoring
Refs #7860 Remove redundant code from project.
Merge branch 'master' into feature/7860_indirect_symmetrise

Conflicts:
	Code/Mantid/Framework/PythonInterface/plugins/algorithms/WorkflowAlgorithms/Symmetrise.py

Refs #7860
Remove WIKI header from Symmetrise.py

Refs #7860
Initial addition of Symmetrise tab

Refs #7860
Added more to Symmetrise tab

Refs #7860
Merge branch 'feature/7860_indirect_symmetrise' into develop