WIP testnd multiprocessing:  t_1samp_perm
WIP ttest_rel
WIP ttest_ind
WIP corr
ENH opt anova:  perm through argument
WIP anova
WIP t_contrast
DOC datasets
STY testnd:  move t-contrast to separate module
LOG permutation
OPT anova:  permute model instead of data
OPT opt:  remove perm argument
ENH ClusterDist:  store Eelbrain version