nsf.c

- nsf.c: * moved implementation of ::nsf::method::delete to C * produce same error messages when methods are delete via nsf::method::delete and nsf::method::create {} {} * Prohibit deletion of methods during shutdown. Otherwise when destructors delete methods, some other destructors depending on these methods will fail. Cleanup deletes all methods anyway. * Provided alternative (faster) way of dispatching nsf::procs (can be tured off with NSF_INVOKE_SHADOWED_TRADITIONAL) * renamed NsfMethodCmd() into NsfMethodCreateCmd() for consistency * nsf works with OpenACS again (requires new nstrace.tcl, aolserver-openacs.tcl, and 01-debug-procs.tcl).