vim: fix Python indentation & fix neovim in virtualenvs
vim: fix Python indentation & fix neovim in virtualenvs

I think I included that Python indentation code a long time ago when
vim's default indentation rules were less then ideal. It seems like
that's been fixed now -- at least in Neovim.
This also fixes the Python executable so that the Neovim Python package
is always found, even if we're running Neovim inside of a virtualenv.

Procrat/dotfiles,Procrat/dotfiles