g_date_time_new_local() expects month in range 1..12
but localtime() returns month in range 0..11.
g_date_time_new_local() also expects absolute value
for year but localtime() returns number of years since 1900.
Adding 1 to month and 1900 to year fixes this.
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.
