- nsf.c: * added preliminary/minimal "private" support * private can be called via "my -local", direct dispatches are forbidden, ignored in mixins and next; * extended regression test
- nx.tcl: * made "/cls/ class ..." using ensemble methods and therefore extensible. * This introduces some definition order dependencies in nx.tcl and some redundancy ("class filter" and "class mixin"), but maybe this can be eliminated.