This PR contains both #35 and #46
After reviewing the changes from @soig in #46, I've merged it into a new pull
request, after doing some tweaking and git sorcery. This obsoletes #35 and #46.
From #35
Per the recommendation of Nick Coghlan and Toshio Kuratomi, `pythonXegg(M)` is
being
Major change: introduction of attr file to enable the dependency generator
by default.
This pull request contains @soig's attr file to enable the dependency generator
by default, adapted to also read python wheel data too.
Do we want to enable this dependency generator by default in RPM,