Add HEXHASH_WORD per users list question

git-svn-id: https://svn.apache.org/repos/asf/spamassassin/trunk@1567757 13f79535-47bb-0310-9956-ffa450edef68
tweak __HEXHASHWORD

git-svn-id: https://svn.apache.org/repos/asf/spamassassin/trunk@1567765 13f79535-47bb-0310-9956-ffa450edef68