LDEV-2642,
LDEV-2616: Move Planner activity metadata (hidden, collapsed, expanded) to a separate table, as it may grow in the future and we don't want to make ToolActivity too complex. Move Editing Advice content from Online Instructions in activities to the metadata table. Allow editing the Editing Advice straight from the planner. Use jquery_ui instead of cluetip (dispose the last one completely). While creating a node, the Learning Design is imported just once from ZIP into DB, instead of importing it each time someone opens it in Planner. This allows less unnecessary copies of the LD and allows easier modfication of the original design. Change the way a Teacher gets a copy of the design. When opening the template in Planner, a copy is made in common folder ("Planner preview"). When the user saves the design, the same copy is *moved* to user's folder, rather than copying it again. Futhermore, each subsequent save modifies the same LD rather than making another copy.
