…pytest-benchmark

[REVIEW] Katz Centrality : Auto calculation of alpha parameter if set to none

…TL steps (pre-compute adj lists, renumber), flake8, CHANGELOG, cleanup.

…h, reused utility from test submodule, removed unused imports.

…pytest-benchmark

[REVIEW] Enable C/C++ docs via Doxygen

…russ-raii

…pytest-benchmark

…-ktruss-raii

 1) Code cleanup, a bit more modularization
 2) Fix python bindings to work with new code
 3) Now that Louvain works, debug ECG issues

[REVIEW] dask infra updates

[REVIEW] Fix louvain

…Louvain

[REVIEW] Update Louvain notebook

[REVIEW] Fix BFS for directed graphs

[REVIEW] Env and changelog update

[REVIEW] Fix CI error on Force Atlas 2 test

[REVIEW] Remove gunrock from Betweenness Centrality

…is deleted with pointers still referencing it.

[BUG] Updated pagerank with @afender 's temp fix for double-free crash

[REVIEW] Update scikit learn dependency

[REVIEW] Update scikit version to support libgcc-ng 7.3