Add :drop-edge and :drop-node methods for digraphs
#51
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thank you for the PR! I'll try and get this merged later today |
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It seems like sometimes one might need to remove nodes and edges from a digraph as well as adding them. These new methods accomplish that (while also, in the case of
:drop-node, doing cleanup on other nodes' edges to remove any that once pointed to the now-nonexistent node).All tests pass, including four new suites covering the new features. Also expanded the example file to include
:drop-edgeand:drop-node.