628 csw to spp converter

[ldavies99]

Summary

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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
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[BixLaw]

I think theres an issue with line 112 on csw_to_spp_converter. Your using your personal file location, i believe this needs to be made generic.

Also out of curiosity the first two listed items in the mapper seem identical, what are they changing?

Otherwise looks good, nice and simple to understand. Well done