Changes for OVPMS-1511 Stock export and import

git-svn-id: svn://svn.openvpms.org/openvpms/archetypes/trunk@6170 9e4fa352-aafb-0310-9071-df624684024b
Changes for OVPMS-1511 Stock export and import

git-svn-id: svn://svn.openvpms.org/openvpms/archetypes/trunk@6171 9e4fa352-aafb-0310-9071-df624684024b
merged back changes from trunk

git-svn-id: svn://svn.openvpms.org/openvpms/archetypes/branches/1.8-dev@6173 9e4fa352-aafb-0310-9071-df624684024b