ENH ClusterDist:  find local maxima
ENH Dataset:  .add_empty_var()
TEST ClusterDist:  TFCE
ENH ClusterDist:  pickle support
ENH ClusterDist:  separate methods for result properties
ENH ClusterDist:  separate method for cluster properties
ENH ClusterDist:  ADD .masked_parameter_map() method
LOG ClusterDist:  log permutation progress after 1 minute
WIP testnd:  TestResult class
FIX t-contrast:  infer tail from contrast
STY cleanup
DOC:  github username change
ENH data-objects:  ADD .std()
FIX Dataset.__setitem__:  order of key and :
ENH ClusterDist:  dist_dim

collect permutation maxima distribution for all values of one dimension
ENH ClusterDist:  dist_tstep
ENH ClusterDist:  allow arbitrary dist_dim
API NDVar:  index for mne label

old: SourceSpace.label_index -> array
new: SourceSpace.index_for_label -> NDVar
ENH SourceSpace:  add parcellation
FINISH testnd: TestResult class