AMD t-contrast
API cluster tests:  default pmin=0.05
WIP OPT _t_rel
WIP DOC _mne
OPT _Effect.sort_idx()
ENH Interaction: as_effects -> LazyProperty
ENH plot.brain:  ADD copy()
ENH fmtxt HTML:  embed images
FIX TreeModel:  repr without initial state
API MneExperiment:  load_evoked_stc default sns_baseline to (None, 0)
FIX plot.brain:  colorbar and time_label
ENH plot.brain:  ADD bin_table()
ENH fmtxt:  Section.add_image_figure() with Image object