[server] remove not-so-useful entity_name and entity_attr functions, introduce entity_oldnewvalue entity_oldnewvalue(entity, attr) is usable in before_update_entity and returns both old and new value of entity

oops, fix wf entity types vocabulary while in creation

fix vocabulary for destination_state/allowed_transitions when creating state or transition

fix potential key error

actually fix rgx_action

fix UnboundLocalError

[forms] add setFormsTarget() to the list of postAjaxLoad callbacks to have iframe on ajax-rendered forms