Request width of 720 pixels for jobs dialog and
constrain maximal number of character in displayed
jobs titles to 40 chars. Ellipsize at the end
if the job title is longer.
https://bugzilla.gnome.org/show_bug.cgi?id=758170
This commit adds popup dialog to jobs dialog which can be accessed
if there is a print job which needs authentication.
Clicking "Authenticate" button will reveal this dialog
where user can enter credential info for the actual printer
and clicking the "Authenticate" in it will authenticate all
print jobs of this printer which needs authentication info
and will send them for printing.
https://bugzilla.gnome.org/show_bug.cgi?id=758170
This commit places list of jobs to separate dialog. The dialog
is updated through calling of pp_jobs_dialog_update()
from "Printers" panel because the panel is already subscribed
to cups notifications.
