STY MneExperiment.make_besa_evt()
FIX MneExperiment:  assign `subject` field values `[]` when `find_subjects==False`
FIX MneExperiment.plot_annot()
STY:  eellab imports * from lab
STY EXA:  replace `eelbrain.eellab` with `eelbrain.lab`
ENH fmtxt:  `Section.add_image_figure()` allow adding image from existing file
STY fmtxt