Using pkgs.lib on the spine of module evaluation is problematic
because the pkgs argument depends on the result of module
evaluation. To prevent an infinite recursion, pkgs and some of the
modules are evaluated twice, which is inefficient. Using ‘with lib’
prevents this problem.
Without this the HTML manual and manpage is quite unreadable (newlines
are squashed so it doesn't look like a list anymore).
(Unfortunately, this makes the source unreadable.)
