- generic/nsf.c / NextSearchAndInvoke(): Prior to this commit, next calls from within submethod leaves resulted in the interp's unknown flag to be set. While for dispatches without filter indirection this remains hidden and unnoticed, registered filters triggered an unwanted unknown dispatch in such scenarios. Consequently, such leaf next's in submethods behaved differently from the method equivalents. The patch identifies such leaf-next dispatches by watching out for a characteristic callstack structure. - tests/submethods.test: Add a characteristic test for the above patch. - tests/disposition.test: Some cleanup ...
- nx.tcl: * added support for "variable" on the class-level * added flag "noconfig" to object parameter options * parameters with "noconfig" are omitted in "info parameter syntax" and "info parameter list" * used switches for all configurable boolean options for "variable" and "attribute" * regularized the interface of "variable" and "attribute" * extended regression test