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This essentially replaces "neighbours" by "neighbors" throughout.

Aliases using the British spelling (e.g. Vertex.out_neighbours()) are
preserved for compatibility.

This adds the parameter "return_reached" so that the user can provide
and reset the initialization for "dist_map" and "pred_map", to improve
the performance of multiple searches that do not visit the whole graph.

This fixes issue #400

This fixes issue #383.

This changes the underlying adjacency matrix implementation to a single
mixed in + out edge list for each node, instead of separate ones. This
simplifies the undirected_adaptor<> so that its out-edge iterators
become trivial, and also faster.

This fixes issue #300

Now algorithms rely more on parallel_{vertex/edge}_loop() and global
the paralellization threshold is honored.

This fixes issue #191

This closes issue #293

This fixes issue #287

This fixes issue #278.

Use int64_t instead of int32_t as the default label type.