adds the local command

[salotz]

WIP as I try to understand the code but I want to add an option to make virtualenvs in any directory.

I want to leverage the multiple python versions with pyenv as well as making a lot of virtualenvs for testing projects (of which there can be a lot of).

I tend to use the global listing of virtualenvs (in $PYENV_ROOT) as ambient workspaces for general purpose work. Using very specific environments for different testing purposes.

It is a separate command because I still need to test the original as the code looks very delicate.