Merge pull request #536 from nschloe/lgtm

lgtm

Merge pull request #534 from nschloe/new-mpl

update test mpl version

Merge pull request #533 from nschloe/posix-fix

posix fix

Merge pull request #530 from nschloe/filepaths-windows

try windows tests

Merge pull request #519 from nschloe/update-mpl-tests

update mpl for tests

Merge pull request #517 from nschloe/python3.7

Python 3.7

Merge pull request #515 from nschloe/3.10

support 3.10

Merge pull request #504 from nschloe/tables-fixes

Tables fixes

Merge pull request #501 from nschloe/more-externalize

More externalize

Merge pull request #500 from nschloe/tables-fix-2

external tables fix