make folders list view refresh automatically according to the actual unread message

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522377 13f79535-47bb-0310-9956-ffa450edef68
add top Deleting... bar when delete message(s)

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522379 13f79535-47bb-0310-9956-ffa450edef68