cubicweb-seda #15047080 backport js tree from saem [validation pending]

some improvements have been done there, they should be backported (via an intermediary cube?)

prioritynormal
typeenhancement
done in0.5.0
load left0.000
closed by#891700ba269e Implement motion of nodes in the SEDA tree
patchImplement motion of nodes in the SEDA tree [applied][views] Update jqtree code, copied back from cubicweb-saem_ref [applied]