ADD MneExperiment.plot_evoked()
API MneExperiment.load_epochs():  default to ndvar=True
FIX/ENH plot.UTSStat():  error plotting

ENH: Don’t plot lines around error
FIX: error=‘all’ option
DOC MneExperiment:  error for missing clm raw file
FR MneExperiment._set_inv_from_str: use regex
ENH MneExperiment:  groups based on exclusion
ENH MneExperiment:  regularization settings