updated scores for revision 1575870 active rules added since last mass-check

git-svn-id: https://svn.apache.org/repos/asf/spamassassin/trunk@1576181 13f79535-47bb-0310-9956-ffa450edef68
tune END_FUTURE_EMAILS, add some test rules for unsubscribe texts

git-svn-id: https://svn.apache.org/repos/asf/spamassassin/trunk@1576183 13f79535-47bb-0310-9956-ffa450edef68