DEV: fix paths in coverage reports

[rmcar17]

Installs diverse_seq in editable mode when running the tests to ensure correct paths in the coverage reports

[coveralls]

Pull Request Test Coverage Report for Build 11026972091

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 92.512%

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Totals
Change from base Build 11023325796:	0.04%
Covered Lines:	1112
Relevant Lines:	1202

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💛 - Coveralls

[rmcar17]

How about something like this, running nox now has the same behaviour as before, but there is an extra function that the ci can use that makes sure that the coverage reports are sent properly to coveralls.