ENH mne_experiment:  set epochs through e.set()
STY/RM mne_experiment:  cell handling
ENH  mne_experiment:  make "root" a normal template
DOC
RM: mne_experiment.subject_has_own_mri
ENH mne_experiment:  cleanup state maintenance
ENH mne_experiment:  parcel out :meth:`.load_selected_events()`
ENH mne_experiment:  export for BESA;  add {epoch-nodecim} entry
ADD mne_experiment.list_values():  to list var_vals
ENH SelectEpochs:  warn if blink=True and no Edf in ds.info
ENH:  add gui module to eelbrain
ENH mne_experiment:  use '-' instead of '_' in all templates
ENH mne_experiment:  make template names consistent
ENH SelectEpochs:  'b' key -> open butterfly plot
ENH Edf:  pickle support
ENH mne_experiment:  cache events in raw-file
ENH notification:  check whether pwd file exists on init
ENH mne_experiment.set():  check var_values by default, better error message
ADD:  mne_experiment.list_files()
ENH SelectEpochs:  Keep track of unsaved changes