- use in forwarders "-frame object" instead of "-objframe" in nx for consistency with other calls (e.g. dispatch). Other values for "-frame" are not allowed. (btw, XOTcl has "-objscope")
- 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.