LDEV-2642, LDEV-2646: Extend access control for Planner nodes. Add a node's owner field. Fix exporting/importing nodes. Upgrade XStream from 1.1 to 1.1.3.
LDEV-2628 * Add a column (text field) to Edit integrated server (lams_ext_server_org_map ) for reporting back the lesson finish event*merge from lams2_3_release
LDEV-2646: Allow access control for viewing/editing a copy/original template in Planner nodes for Teachers. Swap collapse/expand arrows - it seems more right now. Some clean up - move PlannerActivityMetadata to a proper packet, change some labels etc.