python3Packages.torch{,-bin}: rename from pytorch{,-bin}

The proper name for a python package is the one in the setuptools
setup() call, which can also be seen on pypi.

Correct: https://pypi.org/project/torch/
Wrong: https://pypi.org/project/pytorch/

Includes a treewide rename of the attribute and creates aliases for the
old name.

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

@@ -1,7 +1,7 @@
 { lib
 , buildPythonPackage
 , fetchFromGitHub
-, pytorch
+, torch
 , ninja
 , scipy
 , which
@@ -48,7 +48,7 @@ buildPythonPackage rec {
     export HOME=$(mktemp -d)
   '';
 
-  propagatedBuildInputs = [ pytorch pybind11 ];
+  propagatedBuildInputs = [ torch pybind11 ];
 
   checkInputs = [
     which