* [BACKWARD INCOMPATIBILITY] [Python and R] Inequality measures
are no longer referred to as inequity measures.
* [BACKWARD INCOMPATIBILITY] [Python and R]
Some external cluster validity measures were renamed:
`adjusted_asymmetric_accuracy` -> `normalized_clustering_accuracy`,
`normalized_accuracy` -> `normalized_pivoted_accuracy`.
* [BACKWARD INCOMPATIBILITY] [Python] `compare_partitions2` has been removed,
as `compare_partitions` and other partition similarity scores
now support both pairs of label vectors `(x, y)` and confusion matrices
`(x=C, y=None)`.
* [Python and R] New parameter to `pair_sets_index`: `clipped`.
* In `normalizing_permutation` and external cluster validity measures,
the input matrices can now be of the type `double`.
* [BUGFIX] [Python] 80: Fixed adjustment for `nmslib_n_neighbors`
in small samples.
* [BUGFIX] [Python] 82: `cluster_validity` submodule not imported.
* [BUGFIX] Some external cluster validity measures
now handle NaNs better and are slightly less prone to round-off errors.