compound IFE and IFN conditionals

[JONL at MIT-MC (Jon L White)]

Better to say <1-QIO> rather than <QIO-1>.  Although the latter
will work in conjunctions e.g. "IFE USELESS*<QIO-1>"  it will fail
in disjunctions e.g. "IFE USELESS+<1-QIO>".  Probably using "\"
rather than "+" is a win too, but it cant hurt to use the positive
form of the negation. (??)