Behaviour changed in commit 5a8e4186.

Also, add iptables/ip6tables example configuration.

Required to share the connectivity with others.

It doesn't matter anymore if there are many off nodes, because the registry
only queries the addresses of nodes that are in the routing table.

This simplify network configuration a lot, and on recent kernels, this fixes
wrong source address for extra interfaces that already have a public IP.

The way peer addresses were exchanged polluted caches with information about
dead nodes. In particular, bootstrapping often took a long time because the
cache of the primary node was mostly useless.

This also fixes bootstrap of registry.

It's normally safe to use --table=0 because most nodes use SLAAC and by default,
any existing default route is deleted.
It's better to abort if someone who explicitely wants to use a separate table
whereas the kernel is limited.

A lot of bug fix

Removing of the bandwidth calculation

When 2 tunnels are estabilshed between the same 2 peers, one of them is deleted

Remove the refresh-rate option

Added new simulation results.

Check for dead tunnels evry 5 seconds instead of waiting for the next tunnel_refresh