479 o weight constraints

[Jday7879]

Summary

Functionality to implement outlier weight constraints.
This calculates the derived question values post winsorisation and will update outlier weight for derived questions, adding flag column to denote which values have been updated.

Checklists

This pull request meets the following requirements:

• installable with all dependencies recorded
• runs without error
• follows PEP8 and project specific conventions
• appropriate use of comments, for example no descriptive comments
• functions documented using Numpy style docstings
• assumptions and decisions log considered and updated if appropriate
• unit tests have been updated to cover essential functionality for a reasonable range of inputs and conditions
• other forms of testing such as end-to-end and user-interface testing have been considered and updated as required
• tests suite passes (locally as a minimum)
• peer reviewed with review recorded

If you feel some of these conditions do not apply for this pull request, please
add a comment to explain why.

[giuliag92]

Hey Jordan, this is great! I just made a minor comment on one of the docs. Great job!!

[Jday7879]

@giuliag92 Changes have been made and ready for re review / approval :)

[giuliag92]

Perfect! Great job, Jordan :)