[SciPy-Dev] requesting code review: added close matches to constants.codata.value()

[Kevin Davies]

I changed scipy.constants.codata.values() to suggest alternative 
spellings when an entry isn't found.  Instead of a key error, 
values('magnetic constant') prints what is shown in this screenshot.

Here's the code comparison:
https://github.com/kdavies4/scipy/compare/suggest-codata

This introduces a dependency on difflib, which I haven't added to the 
installation.
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