Log Message:
Extract most of MESSAGE to README.pkgsrc. (MESSAGE was getting too long.)

Comment out qmail-qfilter-viruscan in control/smtpfilters. It's not a
very precise tool, so the cost (false positives) probably outweighs the
benefit (blocked malware attachments) for many users.

Also not a sensible default: rejecting incoming mail on SPF
explicit-fail. This needs to be an admin decision because, among other
reasons, it would also reject messages forwarded through servers that
haven't configured SRS. Document SPF setup, including how to reject
(with this caveat) and how to greylist SPF explicit-pass (which would
otherwise be exempted from greylisting).

Rename greylisting-spp-with-exemptions to greylisting-spp-wrapper. Add a
feature: to effectively omit IP from the (IP,sender,recipient) tuple,
add GL_WRAPPER_TCPREMOTEIP="127.127.127.127" to control/tcprules/smtp.

rc.d scripts:

- Location of tcprules file is configurable
- By default, CDB is auto-rebuilt as needed on service start
- CDB auto-rebuilding can be configured off

Bump version.