Log Message:
Update to 2.42.
Uses buildlink2 and module.mk. Some perl scripts for rule developers
(in PREFIX/share/doc/spamassassin/{masses,tools}/) and a small SpamAssassin
logo (PREFIX/share/doc/spamassassin/html/) are now included.
New netbsd_lists.cf file to reduce false positives on NetBSD lists (so
far, only some rules for netbsd-bugs).

Changes:
- bug fixes
- new, better scores (intensive testing was done to improve on 2.40 and
  2.41)
- netbsd rc.d script works now with NetBSD 1.5 and 1.6
- management of addresses in the automatic whitlist now easier with
  dedicated options (--add-addr-to-whitelist, --remove-addr-from-whitelist)