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Description
Our docstrings currently use a variety of formats and we should agree a standard.
My suggestion is that we use Numpydoc (https://github.com/numpy/numpy/blob/master/doc/HOWTO_DOCUMENT.rst.txt) since it's the closest to anything we currently have.
Tasks required are:
- Agree the standard we're adopting
- Tidy up the existing docstrings to meet that standard
- Add some instructions to docs/contributing.rst