nx.tcl: - property has now a boolean non-positional argument "-config" /obj|cls/ property ?-accessor value? ?-config boolean? ?-incremental? ?-class value? spec ?initblock? in symmetry with "-accessor" (parameter option "noconfig" is still needed to flag nsf for variables that should be initialized, which are not configurable - "/obj|cls/ info slot definitions" returns a full command (containing flags and property|variable) - extended regression test