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/reikna/default.nix

@@ -1,5 +1,5 @@
 { stdenv
-, fetchurl
+, fetchPypi
 , buildPythonPackage
 , sphinx
 , pytestcov
@@ -13,15 +13,14 @@
 
 buildPythonPackage rec {
   pname = "reikna";
-  name = "${pname}-${version}";
   version = "0.6.8";
 
-  src = fetchurl {
-    url = "mirror://pypi/${builtins.substring 0 1 pname}/${pname}/${name}.tar.gz";
+  src = fetchPypi {
+    inherit pname version;
     sha256 = "34d92786237bef9ab5d37d78f01c155d0dcd1fc24df7782af9498a9f1786890c";
   };
 
-  buildInputs = [ sphinx pytestcov pytest ];
+  checkInputs = [ sphinx pytestcov pytest ];
 
   propagatedBuildInputs = [ Mako numpy funcsigs ]
     ++ stdenv.lib.optional withCuda pycuda