cleanup (RM `mne2ndvar()`)
ENH: expose `exclude` kwarg, with default 'bads'
ENH: `mne_experiment.iter_vars()` `variables` kwarg

 - allow value to be str
 - default to ['subject']
ENH: load.fiff

 - ENH epochs_ndvar(): more options from add_epochs()
 - RF add_epochs(): use epochs_ndvar()
 - ENH evoked(): add colorspace
ENH/RF print_funcs

separate different functions (repr_1line (), strlist())
ENH mne_experiment: trans file path should include {mrisubject}
ENH mne_experiemnt: add .run_subp() method
ENH: testnd t-test splitting of big arrays

look for best axis to split on
ENH: mne_experiment.load_events() should always use proj from state

set state default proj='""
ENH: update mne kwargs
DOC
ENH ImageTiler: add `overwrite` arg to `.make_frame()`
ENH: line-width for plotting geom as wireframe
FIX plot.coreg.dev_mri(): Use ImageTiler properly
ENH mne_experiment.makeplt_coreg(): make only 1 plot