[Debian-med-packaging] Bug#934254: Bug#934254: Time to provide python3-mne package

[Alexandre Gramfort]

thanks Yarik for looking into this.

Unless there is a bug it's perfectly possible to run the mne-python tests
withing mayavi. All tests that require mayavi are decorated to be skipped
if mayavi is not installed. See:

https://github.com/mne-tools/mne-python/blob/master/mne/viz/tests/test_3d.py#L334

Alex