With setuptools it is possible to define optional sets of packages.
Sometimes packages may require a dependency with such extras. In that
case we could now add e.g. twisted.extras.tls to the
propagatedBuildInputs.
* Updated scons to version 1.0.0. Also added appropriate makeWrapper calls to
ensure that the python binary finds its library files.
* Updated Twisted from 2.5 to 8.1.
* Added an expression for buildbot.
svn path=/nixpkgs/trunk/; revision=12782
This is so that the Unison wrapper can be generated with
makeWrapper.
* Use makeWrapper as a buildInput everywhere.
* Updated BitTorrent, cvs2svn.
svn path=/nixpkgs/trunk/; revision=10213