Database change:
================
Remove $(org_domain) as a global variable.

Modify procedures recv_from_domain and sent_to_domain
so as to not increase the 'whitelisted' if it is negative.
That way shoot-on-sight works.

Simplify the call 'db_sql_domain_flags' in zdkimfilter.conf.
Now it retrieves a single line on each call.


Build change:
=============

Removed obsolete zdkimfilter.spec


Documentation:
==============

Revise zfilter_db(1) man page.


Bug fixes:
==========

Fix behavior of domain flags and $(prefix_len),
don't bail out on conf file errors.