More FP avoidance

git-svn-id: https://svn.apache.org/repos/asf/spamassassin/trunk@1441489 13f79535-47bb-0310-9956-ffa450edef68
documentation detail, debugging detail

git-svn-id: https://svn.apache.org/repos/asf/spamassassin/trunk@1441511 13f79535-47bb-0310-9956-ffa450edef68