Added loading tun/tap settings from netconfig. Fix for 793367.

LanItems global config variables for tun/tap devices haven't been
set according existing configuration.
Updated changelog. Bumped minor version number for next OpenSUSE release
Small refactoring.

Removed useless condition, dead code. Replaced usage of
LanItems::current by getCurrentItem in AddressDialog.
Merge pull request #81 from mchf/bnc793367-tun-tap-lost-group

Tun / tap settings wasn't loaded from netconfig file.