+ Load flyspell-mode a little later, to allow file/dir-local variables
to customize flyspell.
+ Ensure setters (in merlin's config) are used as late as possible, by
making merlin's (and all the other packages) config run after tuareg
is loaded.
+ As discussed, installing packages locally is a bit unreliable, so I'm
commenting out the +ocaml-site-lisp flag, and rely solely on packages
from MELPA.
+ Add optional ocamlformat check in doctor.el and conditionally load the
ocamlformat package (if editor/format is enabled).
+ Add docstrings to init hooks.
