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
Fix Windows compile error

Refs #7860
Temp removal of failing usage example

Refs #7860
Refactoring, fixed usage example

Refs #7860
Edited algo to act as intended

Refs #7860
Fixed negative and positive edge finding

Refs #7860
Refactoring, restrict IDR UI to reduced files/ws

Refs #7860
Refactor, fix issue with some sample workspaces

Some workspaces have differing numbers of array elements for X, Y and E
values, just choose the samllest and trim the longer arrays

Refs #7860
Added unit test, improved usage example

Refs #7860
Added preview window to IDR:Symmetrise

Refs #7860
Added spectra range option, updated UI

Refs #7860