ENH MneExperiment:  add cluster mean box plot and pairwise tests
FMText:  change default fmt to “%s”
ENH fmtxt:  add string_substutions

- property=“_” -> “(%s)”
ENH NDVar:  Allow 1d boolean NDVar as argument in summary methods
API pep8: eelfigure -> _EelFigure
API plot.uv:  capitalize names, use EelFigure
CLN test
ENH EelFigure:  add .image() method to produce FMTXT Image
FIX mne:  mne API change (mne.io)
API EelFigure:  increase default size
WIP EXA source_cluster