Request for feature: Bipartite Graph Projection

Hi,

From our discussion:

http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/Efficient-Bipartite-Projection-tp4025895.html;cid=1417425123974-777

I was told to open an issue for this feature here.

I am looking for a bipartite graph projection feature. Specifically I have 'g', a weighted graph and would like to have some way that the projections 'g1', and 'g2' to be also a weighted graph. I have been particularly curious on seeing both a way the projections receive on their edges the sum of the weights on graph g as well.

Thank you,

Carlos A.