TL/03 Bugzilla 198 - Implement remove_header ACL modifier.
Patch by Magnus Holmgren from 2007-02-20.
+TL/04 Bugzilla 1281 - Spec typo.
+
JH/01 Bugzilla 1201 & 304 - New cutthrough-delivery feature, with TLS support.
JH/02 Support "G" suffix to numbers in ${if comparisons.