Code review request

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Purpose of code changes on this branch:
 * A demo of an alternative implementation of digraph intended to be more
scalable. This is mainly intended for discussion, rather than immediate
inclusion.
 * Some changes to Christian's digraph interface to make it work with
Python 3.x (spesifically removal of the argument unpacking on edge methods)
 * Removal of the "attrs" feature
 * A new way of doing labeling where labels are merely extra properties on
a dict representing neighbours of an object.

When reviewing my code changes, please focus on:

 * Consistency with our existing API
 * Scalability to very large orders.

This code is intended for inclusion in /trunk after the next release, or
possibly after that.

Original issue reported on code.google.com by salimfadhley@gmail.com on 10 Nov 2009 at 1:20

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Original comment by salimfadhley@gmail.com on 10 Nov 2009 at 1:25

• Changed title: Code review request

[GoogleCodeExporter]

Set review issue status to: Done

Original comment by christian.muise on 10 Nov 2009 at 3:25

• Changed state: Done

[GoogleCodeExporter]

Set review issue status to: New

Original comment by christian.muise on 10 Nov 2009 at 3:25

• Changed state: New

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Original comment by pmatiello on 17 Nov 2009 at 1:05

• Changed state: Done