backport stable

fix session's commit handling: when an operation failed in [pre]commit, call rollback_event as well for already processed operation, not only the revert<event> callback

race condition may makes this assertion fail, we don't want that

unvisible field may have been modified, for instance relation added by an hidden input

AdaptedList -> SameETypeList *NO BW COMPAT*, benefit from cw 3.6 releasing of folder,file and blog which use it to get update at the same time. CMHN and PEGASE will need update (but won't go to 3.6 without update, so seem fine).

now raise UnknownProperty, not KeyError

fix test broken by introduction of ViewSameEType action

kill register_appobject_class method, simplifying autoregistration. Update test accordingly (test which manually registers object should also properly call there __register__ method). Drop the disable-appobjects config file entry: no one used it since its introduction years ago.