Netjack dev: Squashed Interface selection plus IPv6

Hi,
Here's a new branch with rebased and squashed patches.
I've run some tests and ubuntu debs are available at https://launchpad.net/~rufferson/+archive/snd for further testing.
No windows support, mac should be ok since I've followed precisely POSIX's IEEE Std 1003.1, 2004 Edition.
Commits contain more descriptive logs.
Regards,
Ruslan