Test with different Python versions

DOC: restore viewcode highlighting, disable unwanted highlighting #169

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Run time

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Job	Run time
python (3.7)	32s
python (3.8)	31s
python (3.9)	16s
python (3.10)	30s
python (pypy-3.7)	27s
python (pypy-3.8)	24s
	2m 40s