Title should be something like "Add an option to exclude source IP addresses from transparent web proxying" because destination IP is a different option.

@dmbaturin Did you forget to merge the other PRs (migration code) ?

A new description could be:

Ok. Fine. Can you give me a hint about docu and an example of such a migration script? So I'll try to implement one for this case: Migrate from webproxy proxy-bypass 1.2.3.4/24 to webproxy whitelist destination-address 1.2.3.4/24

Thank you for your positive feedback. I am open to all changes.
We can rename the command, of course. But let us think about this shortly:

That change should be safe to merge because it just adds a command and doesn't change anything else. So no one will be using this at the moment and so it won't have any impact. So I'd be happy to see it in 1.2.0.

Maybe it's a good idea to 1. use the new syntax but 2. generate less line breaks. e.g.

interfaces {
  ethernet { eth0 {
      vif {
          99 { address 192.0.2.1/24; }
          101 { address 203.0.113.1/24; }
      }
  } }
}

In this case the new syntax would be fine for me. (Details open for discussion.)