cubicweb #2518980 show RQLQuery internalswith str() [done]

RQLQuery is a small helper found in wev/views/editcontoller

For debugging purposes it should NOT print opaquely.

prioritynormal
typebug
done in3.16.2
load0.100
load left0.000
closed by#0d81a474c0fe [editcontroller] a small debugging help (closes #2518980)
patch[editcontoller] a small debugging help (closes #2518980) [applied]