Added mercurial and eventlet to debian installation

darcs-hash:20081128222435-58252-abde041c8909d2f77923e2d3432a83a18d9896ea
Improve sequence of steps for debian installation

darcs-hash:20081128223017-58252-e474bc4a37ce008745f5e9b03dc0a8b9a389cd4c