QPID-5255: Change trunk version to 0.27

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1541283 13f79535-47bb-0310-9956-ffa450edef68
QPID-5325: Improve a tooltip message for checkbox to save tab in preferences

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1541353 13f79535-47bb-0310-9956-ffa450edef68