Switch to pytest and add optional Python 3.8 test#380

Merged

murrayrm merged 12 commits intopython-control:masterfrom

murrayrm:setup-test-deprecated

Mar 25, 2020

Commits on Mar 21, 2020

Commits on Mar 22, 2020

remove unneeded initialization code that was causing problems with pytest on MacOS
murrayrm
committed
fix small typo in test file (probably irrelevent)
murrayrm
committed

Commits on Mar 24, 2020

remove unused (and sometimes incorrect) creation of test suites and run_all.py
murrayrm
committed