plain-object-method.test

nx.tcl: pluralism reform part 2 - changed methods /cls/ info subclass -> /cls/ info subclasses /cls/ info superclass -> /cls/ info superclasses /cls/ mixin ... -> /cls/ mixins /cls/ filter ... -> /cls/ filters /cls/ object mixin ... -> /cls/ object mixins /cls/ object filter ... -> /cls/ object filters - changed configure parameters /cls/ configure -mixin -> /cls/ configure -mixins /cls/ configure -filter -> /cls/ configure -filters /obj/ configure -object-mixin -> /obj/ configure -object-mixins /obj/ configure -object-filter -> /obj/ configure -object-filters - added handling for calling relationslot with unknown sub method