FIX ClusterDist:  pickling ANOVA with clusters in only some effects

set cdist._i to 0 if not clusters found
RF MneExperiment:  modularize make_report
ENH MneExperiment cluster report: section headings

Don’t repeat “Clusters in” every time
TEST fmtxt
ENH plot.brain.bin_table():  expose summary method as kwarg
FIX testnd:  standard permutation test (tailedness)

make probability map into LazyProperty
EXA meg:  ADD basic permutation test
EXA meg:  ENH cluster permutation test
CLN MneExperiment
WIP mne API Label.fill()