'device-class' property of PpPrintDevice can contain "network"
or "direct" values. This information can be stored in already
present property 'is-network-device' as well.
https://bugzilla.gnome.org/show_bug.cgi?id=749830
Add parameter which enables showing of authentication dialog
for Samba servers which need authentication.
Add samba server to the internal list of found devices if it needs
authentication and the authentication is disabled.
https://bugzilla.gnome.org/show_bug.cgi?id=698532
Add class PpSamba which contains asynchronous function
for searching for samba-shared printers. It can search
for printers on local network or on a specific host if
needed.
https://bugzilla.gnome.org/show_bug.cgi?id=683229