Merge branch 'master' into emergency

Merge branch 'master' into emergency

* master:
  functions.m4: Write the netclass ids to the trace output.
  bookends.m4: If debugging, dump the final tables.
  Determine forwarding and reverse-path filtering from host definitions.
  Overhaul address classification.
  local.m4: Promote the NTP server configuration to a proper variable.
  Renumber the diversions.
  fixup! WIP on emergency: 7a108d1 Makefile: New target for tracking diversions.
  Makefile: New target for tracking diversions.
  Makefile, base.m4: Inject the target hostname into the generated script.

Semantic conflict: The variable `if_dmz' is no longer set, so just
hardwire the interface name.