Log Message:
On second thought, greylisting isn't a sensible default. Comment it out
in control/smtpplugins. Extract a "Greylisting" stanza in MESSAGE. Merge
"Local non-root users to see the queue" into previous section (and
provide qmail-qread-client in example mailer.conf to begin with).
Mention port numbers where applicable.

Enable defaults that are sensible: realrcptto in control/rcptchecks and
viruscan in control/smtpfilters.

Add fixsmtpio rules to make greylisting-spp's tempfails look more like
qmail's other messages.

Bump dependency on qmail for config-fast-pkgsrc, which is like
config-fast but lets us simulate CONF_FILES-like behavior. As before, we
install these minimal config files, and won't deinstall them. (But the
updated qmail package will.)

Bump version.