The `buildPython*` function computes name from `pname` and `version`.
This change removes `name` attribute from all expressions in
`pkgs/development/python-modules`.
While at it, some other minor changes were made as well, such as
replacing `fetchurl` calls with `fetchPypi`.
Upstream changes:
* Record all SSL errors instead of only the first
* Pass arguments to plugin/plugout methods
* Allow the Roster to be initalized without requesting it from the
server
Tested by building and running Gajim 1.0.3.
Signed-off-by: aszlig <aszlig@nix.build>
Cc: @abbradar
