[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

merge 3.19.12 in 3.20

Added tag 3.19.12, debian/3.19.12-1, centos/3.19.12-1 for changeset 5932de3d50bf

[pkg] prepare 3.19.12

[web/views/formrenderer] remove `cubicweb:target` attribute on form once the target <iframe> is inserted For some unknown reason, IE9 does not want to submit the form inside the <iframe> when the ``cubicweb:target`` attribute exists. (closes #5377672)

[views] implement a custom json error view If the client asked for ``(e)jsonexport`` view, answer him with a json response rather than an error formatted in a big HTML blob. add a custom _requested_vid predicate. In cw 3.21, it will be deprecated in favor of ``match_form_params(vid=('jsonexport', 'ejsonexport'))``

don't override req.form['vid'] in the publisher's error_handler closes #5359234

when some inlined relation is set using cw_edited, its security shouldn't be checked. It's currently checked anyway because upon modification of `cw_edited`, `entity.skip_security` is updated to avoid security checking, but this is only considered for attributes, not relations. Closes #5477315