Improve Workflow Algorithm Documentation and Testing

[Nick Draper]

Documentation for these should include a workflow diagram. "We need some improved checking tools for python, this may already be done under #8917

-- TO BE AGREED BY ALL AFTER THOUGHT--

1. Future workflow algs should be Python algs unless there is a reason to do otherwise.
2. Some existing may require porting if Nested history and improved documentation is not sufficient " NOT NEEDED.
3. Implement a python static code analysis tool Pylint Done
4. using dot for flowcharts in the future - another ticket

[Nick Draper]

Move all SSC tickets to critical by default

[Owen Arnold]

I agree with the better documentation and flow diagrams. I do not agree that all workflow (dataprocessing algorithms) should be in python. The nested workspace history introduced in 2014 mitigates this requirement.

[Nick Draper]

All of the aspects of this that need doing are I beleive done, the SSC 20215 were happy with the current situation and level of workflow documentation and Nested history support.

[Nick Draper]

Batch modify all SSC tickets to critical priority (this will also show up as an update for all those already as critical)

[Stuart Campbell]

This ticket has been transferred to github issue ​10117