Change default link bandwith to 0. The reasoning behind this decision

Change default link bandwith to 0.  The reasoning behind this decision
is that as we will target bigger / more complex topologies, the
overhead of emulating link effects might become more pronounced.
ng_pipe nodes when configured for zero bandwith, delay, packet
duplication and loss will bypass the complex queuing and state
keeping / locking code, hence forward the packets with minimal
overhead.

While here, once again change the default settings for which
parameters will be displayed in the editor.  Displaying link labels,
ifnames and IPv4 addresses is now on by default, while displaying
of IPv6 addresses is not.

Bug found by:
Submitted by:
Reviewed by:
Approved by:
Obtained from: