graph.maxflow() was renamed to max_flow() to create a more
consistent API.
Arguments
- graph
The input graph.
- source
The id of the source vertex.
- target
The id of the target vertex (sometimes also called sink).
- capacity
Vector giving the capacity of the edges. If this is
NULL(the default) then thecapacityedge attribute is used. Note that theweightedge attribute is not used by this function.
