- nsf.c, NsfForwardMethod(): Make sure that a 2nd argument is available for prepending the methodprefix. Earlier, NSF crashed in case of a missing 2nd arg. - Added some basic tests on -methodprefix.
- 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")