an exception in DEV-MODE

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522350 13f79535-47bb-0310-9956-ffa450edef68
fixed issue#55 ; relative the mark as (un)read

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522351 13f79535-47bb-0310-9956-ffa450edef68