4.7: Henning's Monster Diff

Major rewrite by Henning Brauer, shrunk the code, made it faster, plus

• nat-to, rdr-to, binat-to options for pass or match replaced nat, rdr, binat translation rules

• route-to, reply-to, dup-to and fastroute became filtering options

• routing domain translation

• storing and loading state table to/from file

• divert(4) sockets