Rewiring: bugfix, improvements and restructuring resulting in cleaner and faster code
Restructure the rewiring code, introducing further abstraction through class inheritance. Both uncorrelated and correlated cases draw edges directly. This has actually proven faster than drawing vertices for the correlated case, since realizing that indexes could be stored instead of edges. Doing so avoids changes in the pool of candidate edges, which in turn removes the need to rebuild it for each edge to rewire. Consequently, it also makes the uncorrelated case a lot quicker. In the uncorrelated undirected case, the new code also fixes a serious bug: when building the edge pool, only one end of each edge was looked at, because the "edges" vector is not equivalent to drawing all out_edges from all vertices, as is done now.
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