Include tests in PyPi release

[PureTryOut]

It seems that the tarball from PyPi doesn't include the unittests, but they're in the Github release tarball. However, the Github tarball release doesn't include the required submodules in deps/, so now to run tests in distro packaging I need both the PyPi and the Github release and combine the two.

Please include the tests in the PyPi release to not make this necessary.