FIX Celltable:  numerical `X` and `cat`
FIX asndvar:  conversion of list of Evoked
ENH t_contrast:  allow cells with "*"
ENH plot.brain:  image() function to create FMTxt image from Brain
FIX is_fake_mri():  don't expect "label" directory
FIX fmtxt List:  handle subordinate lists; DOC
ENH TreeModel:  compounds

automatically update compounds composed of different elements, skipping
elements that are = ""
ENH MneExperiment:  `sns-kind` compound
ENH MneExperiment:  `evoked-kind` compound
ENH MneExperiment:  ADD option to equalize trial count in evoked files
FIX MneExperiment.load_events():  `edf` kwarg
FIX MneExperiment:  delete mne Raw from evoked-files
ENH MneExperiment:  ADD .make_test() and test-file
FIX MneExperiment:  don`t include `{model}` in evoked-kind
ENH MneExperiment.show_subjects():  return type through argument

return as fmtxt.Table or Dataset
ENH MneExperiment:  ADD .make_report_clusters()