ENH FMTxt.append():  accept FMText parameters
API align:  `out` as last argument (consistent with the documentation)
UPDATE:  mne 0.8 API changes

 - Label.fill()
 - annot I/O
 - Evoked location

AMD mne
API testnd:  use **sub to access partial permutation distribution
FIX testnd.anova:  add .compute_probability_map() method
ENH data-obj:  ADD Categorial dimension
API:  make Var.index() consistent with Factor.index()
ENH testnd:  collect distribution for parcellation
ENH ClusterDist.clusters():  add p_parc corrected across parc
FIX ClusterDist.clusters():  maps for threshold-free tests
FIX ClusterDist:  understand `minsensor` and `minx` argument
ENH MneExperiment.load_test():  proper test caching for parc and tf-tests
ENH MneExperiment.load_test():  add mask parameter
WIP MneExperiment:  make report for threshold-free permutation tests
API TreeModel:  set fmatch default to False
ENH EelFigure.image():  default to bbox_inches=‘tight’