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gcd of rationals--flame added in proof

The claim in the manual that (lcm) should be infinity is outright
wrong, as REM has already pointed out to me.  Probably I was indeed
misled by the formula (/ (* x y) (gcd x y)); I cannot remember.
However, the statement is certainly my fault.  I'm sorry.  Maybe
in the next version of Common Lisp we can safely define (lcm) => 1,
as it will be a compatible extension.