ENH: accept non-int definitions of cluster groups
ENH: use np.unique for indexing clusters
ENH: using human-readable group names instead of integer ids in MultiComparison
added file that got left behind
Put back an import that my IDE incorrectly flagged as unused
Added unit test for the group_order parameter of MultiComparison. It also tests the human-readable labels in TukeyHSDResults are in the right order
Expanded docstring of MultiComparison
Added b prefix to test strings
MAINT: Fix missed usage of deprecated tools.rank
COMPAT: Correct bit_length for 2.6
DOC: Update comment to reflect code. [skip ci]
Merge pull request #1545 from jseabold/rank-cleanup

MAINT: Fix missed usage of deprecated tools.rank
Merge pull request #1547 from jseabold/fix-bit-length-2.6

COMPAT: Correct bit_length for 2.6
REF: First pass at pulling optimization out of LikelihoodModel.
TST: Don't pass DataFrame to numpy
TST: Dont set_index with PeriodIndex. Known bug.
TST: Not a failure if joblib is installed
TST: Use NumpyVersion
TST: Don't use generator. Closes #1145.
REF: Delegate don't inherit