- deactivated "-onerror", since its semantics are expressible via try/catch, and there are no regression tests for xotcl and nx, and we could not find any script that uses this
- library/nx/nx.tcl: Pulling out method contracts (pre- and postconditions) from NX for the time being. Corresponding tests have been commented out or, if applicable, turned into XOTcl2-specific tests.