pythonPackages.bitstring: move to python-modules/

Easier maintenance when expressions are in separate files.

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

···
+{ stdenv, buildPythonPackage, fetchPypi }:
+
+buildPythonPackage rec {
+  pname = "bitstring";
+  version = "3.1.5";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1algq30j6rz12b1902bpw7iijx5lhrfqhl80d4ac6xzkrrpshqy1";
+    extension = "zip";
+  };
+
+  meta = with stdenv.lib; {
+    description = "Module for binary data manipulation";
+    homepage = "https://github.com/scott-griffiths/bitstring";
+    license = licenses.mit;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ bjornfor ];
+  };
+}

pkgs/top-level/python-packages.nix

···
     };
   };
 
-
-  bitstring = buildPythonPackage rec {
-    pname = "bitstring";
-    version = "3.1.5";
-    name = "${pname}-${version}";
-
-    src = fetchPypi {
-      inherit pname version;
-      sha256 = "1algq30j6rz12b1902bpw7iijx5lhrfqhl80d4ac6xzkrrpshqy1";
-      extension = "zip";
-    };
-
-    meta = {
-      description = "Module for binary data manipulation";
-      homepage = "https://github.com/scott-griffiths/bitstring";
-      license = licenses.mit;
-      platforms = platforms.linux;
-      maintainers = with maintainers; [ bjornfor ];
-    };
-  };
+  bitstring = callPackage ../development/python-modules/bitstring { };
 
   blaze = callPackage ../development/python-modules/blaze { };