style of declaring Upstart jobs. While at it, converted them to the
current NixOS module style and improved some option descriptions.
Hopefully I didn't break too much :-)
svn path=/nixos/trunk/; revision=17761
initialising network interfaces, etc.) to modules/tasks. This
follows the Upstart terminology: a service is a job that doesn't
usually terminate (e.g. a daemon), while a task is a job that does
some work and then exits.
svn path=/nixos/branches/modular-nixos/; revision=15771
