- nx.tcl: don't use mixins in method "contains", but remap the new implementation. If there are ten thousands of classes defined, adding mixins to the root meta-class degrades linearly on the number of classes defined (the mixin paths for all classes must be invalidated). This might be a problem for frequent "contains" invocations. - bup version numbers for nx, xotcl2 and nsf to 2.0b2