This surpresses warnings like
> Warning (org-element): ‘org-element-at-point’ cannot be used in non-Org buffer #<buffer *Org Agenda*> (org-agenda-mode)
among others.
The project is archived and no longer available from melpa, so let's keep a
local copy with us.
It might be necessary to add an extra use-package declaration with autoload
definitions, but we'll do that when it's clear it's necessary.
