Re: [boost] [BGL] Stoer–Wagner min-cut algorithm

Attached is version 0.3 of my Stoer–Wagner algorithm implementation

I cleaned up the list of includes in `stoer_wagner_mincut.hpp`, made a few, minor changes to comments, and replaced `*vertices(g).first` as the initial value of the default assignments map with `vertex_descriptor()`. Attached is a unified diff from v. 0.3 `stoer_wagner_mincut.hpp` to what I am calling v. 0.3.1 `stoer_wagner_mincut.hpp`. Lines 199 through 268 of v. 0.3 are now lines 194 through 263 of v. 0.3.1.