Network manager

I just hacked together some updates for those plugins to close #14.

NMPANSupport is yet missing the essential switch to active the new interface.

I saw two code issues in NMPANSupport. Maybe someone can look into this. First, I think we messed up with gconf during the introspection migration. `GConf` gets imported (that's the correct way, isn't it?), but `gconf` gets referenced. Second, my IDE reports dbus.proxies is unknown. I think it should be available anyway, since dbus gets imported, but I'm not sure (most of the times my IDE is cleverer than me :laughing:).