Docs don't say where one is supposed to put a local.cf with
options which are ignored in masses/spamassassin/user_prefs
(like Bayes SQL options, DCC, Pyzor timeouts etc).
I tried to place local.cf into masses/spamassassin/, with
horror results (some directives in local.cf proclaimed as
invalid, as apparently plugins have not yet been loaded
at the time of parsing this file, but only later).
I finally placed it into ../rules/ as mylocal.cf, which
finally works as expected, but I wonder if the is the proper
solution. Should be documented I guess...