Biconnected graph components

`bins = biconncomp(G)`

`bins = biconncomp(G,'OutputForm',form)`

```
[bins,iC]
= biconncomp(___)
```

returns the biconnected components
of graph `bins`

= biconncomp(`G`

)`G`

as bins. The bin numbers indicate which biconnected
component each edge in the graph belongs to. Each edge in `G`

belongs to a single biconnected component, whereas the nodes in `G`

can belong to more than one biconnected component. Two nodes belong to the same
biconnected component if removing any one node from the graph does not disconnect
them.

`[`

additionally returns the node indices `bins`

,`iC`

]
= biconncomp(___)`iC`

indicating which nodes
are cut vertices (also
called articulation points).