FIX fix_annot_names():  only modify if there are unicode names
DOC MneExperiment:  error for missing FreeSurfer
FIX MneExperiment:  allow parc=“lobes”
WIP GUI
WIP GUI:  incorporate SelectEpochs GUI
WIP GUI:  auto-run
WIP GUI
WIP plot:  `frame` argument
DOC plot
WIP _mne:  combine_source_spaces()