Changes for OBF-229 Add description column to node_descriptors to support tool tips

git-svn-id: svn://svn.openvpms.org/openvpms/framework/branches/1.8-dev@6101 9e4fa352-aafb-0310-9071-df624684024b
Changes for OBF-230 Add support for UTF-8 encoded archetype descriptors

git-svn-id: svn://svn.openvpms.org/openvpms/framework/branches/1.8-dev@6111 9e4fa352-aafb-0310-9071-df624684024b