code review fixes (deleting unused lines + sys.path inserts for all t… #308

Job	Run time
check if version is valid	8s
Build the package	1m 13s
documentation-test	1m 44s
Installation on Mac latest	1m 10s
Installation on Windows latest	3m 48s
run test scripts (3.9, ubuntu-latest, 12.x)	1m 40s
run test scripts (3.10, ubuntu-latest, 12.x)	1m 37s
Deploy main documentation	0s
Deploy Dev documentation	0s
delete artifacts	0s
	11m 20s

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