Create some new options for BFSIterator
#389
Open
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Fixes #288.
This PR adds 2 new options, which can be useful when iterating in BFS:
depth_limit
: specify the maximum level at which BFS should stop beforehand.neighbors_type
: specify which function to use when iterating in BFS, e.g. sometimes usinginneighbors
could be useful and this allows that