pythonPackages: remove name attribute`

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`.

pkgs/development/python-modules/pyside/default.nix

@@ -3,7 +3,6 @@
 # This derivation provides a Python module and should therefore be called via `python-packages.nix`.
 buildPythonPackage rec {
   pname = "pyside";
-  name = "${pname}-${version}";
   version = "1.2.4";
   format = "other";
 

pkgs/development/python-modules/pyside/generatorrunner.nix

@@ -3,9 +3,9 @@
 # This derivation does not provide any Python module and should therefore be called via `all-packages.nix`.
 let
   pythonEnv = python2.withPackages(ps: with ps; [ sphinx ]);
-in stdenv.mkDerivation rec {
   pname = "pyside-generatorrunner";
   version = "0.6.16";
+in stdenv.mkDerivation rec {
   name = "${pname}-${version}";
 
   src = fetchurl {

pkgs/development/python-modules/pyside/shiboken.nix

@@ -3,7 +3,6 @@
 # This derivation provides a Python module and should therefore be called via `python-packages.nix`.
 # Python 3.5 is not supported: https://github.com/PySide/Shiboken/issues/77
 buildPythonPackage rec {
-  name = "${pname}-${version}";
   pname = "pyside-shiboken";
   version = "1.2.4";
 

pkgs/development/python-modules/pyside/tools.nix

@@ -4,7 +4,6 @@
 buildPythonPackage rec {
   pname = "pyside-tools";
   version = "0.2.15";
-  name = "${pname}-${version}";
   format = "other";
 
   src = fetchurl {