Git: list versioned files
Zsh: remove -A from tree alias

There seemed to be a strange interaction with direnv, and it's not
really needed anyway.
Vim: disable smartindent

smartindent forces line comments to be left-aligned.
There is a workaround but comments are still unshiftable (e.g. with >>).
Vim: load easytags.vim + deps from github
Ocaml settings

Vim's ocaml mode does not set commentstring correctly.
Make the toplevel use rlwrap if present.