* treewide: http -> https sources
This updates the source urls of all top-level packages from http to
https where possible.
* buildtorrent: fix url and tab -> spaces
- Add support for python bindings
- make neuron respect standard pythonpath prefix
- force exec_prefix == prefix to respect standard nix file hierarchy
- normalize indentation
- propagate dependencies necessary for nrniv_makefile usage
- Add support for darwin