[web/json] Controller.publish must return encoded data We were mixing binary from super() and text from our params, thus wrongly returning text. Closes #5507573.

[entities] fix dc_title output for bool(value) == False Closes #5194853.

[hooks] manhandle the parsed rql query, not its string representation ... and add a groupby clause to make it actually work (the selection might well use an aggregate function, so we need to tell the backend to group on our target entity). Closes #5362574