troubleshoot: read debugging from systemd journal.
Merge branch '1.4.x'
Fixed syntax for python3 exception handling in last merge.
troubleshoot: convert map to list for display.
check-device-ids.py: don't require root password
GIR: NOTHING is a Gdk.EventType (bug #1105229).
PhysicalDevice: convert to UTF-8 before comparing strings (bug #1108903).
Don't download OpenPrinting drivers in D-Bus service (bug #1052203).

It causes a deadlock.
Merge branch '1.4.x'
PhysicalDevice: Fixed __cmp__ conversion to rich comparisons.
PhysicalDevice: removed unnecessary UTF-8 conversions
Don't call monitor.refresh until the password callback has been set.
Avoid jobviewer traceback races (bug #1090479).
Fixed downloadable driver traceback (bug #982071).

Patch from Johannes Goller.
authconn: added method to find out if polkit is being used.
New 'Unlock' button for front-loading authentication.
Only check firewall when when needed.

This means when the user expanded the Network Printer row and there
are no discovered network printers.
Set sensitivity of widgets according to permission.
Merge branch '1.4.x'
tx pull && make update-po