select ct, cal files

[nordme]

This is a fix so mnefun selects the correct calibration and cross talk files for running maxfilter in python. This code should: a) preserve the ability of the user to provide custom files either for ct or cal, b) if no custom files are provided, choose whether to use Vectorview or Triux files based on raw.info['description'] (which encodes which machine was used to record the raw file).

[nordme]

@drammock So, I haven't run checks like pyflakes, etc yet, but I just went ahead and opened the PR so you can see it

[larsoner]

I was thinking of selecting based on info['meas_date'] but as long as we don't mess with 'description' during acquisition (which I think you can in principle but we probably don't in practice) I think this is fine. We can always change to another method later if needed so +1 for this method if it works for you @nordme !

[drammock]

needs merge with main to pass CIs. I'm getting Permission denied even though it looks like the "maintainers may edit" box is checked. @nordme could you pull my flake8 fix, merge in upstream/main, then push?

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@be55c99). Click here to learn what that means. The diff coverage is n/a.

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[larsoner]

Just pushed an empty commit to make CircleCI happy, marking for auto-merge when green. Thanks in advance @nordme !

[drammock]

🙏🏻 @nordme!