Arguments to ALLOC function

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

Let all the arguments to ALLOC be expressible as floating-point numbers.
Thus one could say (ALLOC '(LIST (56.0E3 64.0E3 .2)))  rather than type
some fixnums with lots of trailing (meaningless) zeros.  Since these
quantites are rounded up to the neares multiple of a segment size,
there would be no difficulyt in first fixing the flonum, and then carrying
on.