Making grub display 'All configurations', not 'Old'

That confused some people, as the first generation shown is
the 'current'.
Fix cut-off comment in generated configuration.nix

Pointed out by Mathnerd626 on irc

Signed-off-by: Shea Levy <shea@shealevy.com>
fcron: fixing the startOn, since upstart times.
network-interfaces: fixing a cat/EOF piping confusion
Merge pull request #143 from viric/grub_all

Making grub display 'All configurations', not 'Old'