Changes for  OVPMS-1540 Add logged in user name to log4j output

git-svn-id: svn://svn.openvpms.org/openvpms/vpms/trunk@6326 9e4fa352-aafb-0310-9071-df624684024b
Fix for OVPMS-1541 NPE viewing a product reference

git-svn-id: svn://svn.openvpms.org/openvpms/vpms/trunk@6327 9e4fa352-aafb-0310-9071-df624684024b
Change to ensure alertType is constructed before adding listener to property

git-svn-id: svn://svn.openvpms.org/openvpms/vpms/trunk@6328 9e4fa352-aafb-0310-9071-df624684024b
Change to MainPane to log any errors encountered refreshing the summary

git-svn-id: svn://svn.openvpms.org/openvpms/vpms/trunk@6329 9e4fa352-aafb-0310-9071-df624684024b