Handle weird cases like (ceil 0 0.0)
* src/floatfns.c (double_integer_scale): Distinguish Inf from NaN. (rounding_driver): Handle (ceil 0 0.0) and (ceil 0 1.0e+INF). * test/src/floatfns-tests.el (special-round): Add tests for weird cases like this. Avoid crash with (floor 0 0.0) * src/floatfns.c (rounding_driver): Signal an arithmetic error if divisor is 0.0 or -0.0, instead of crashing.
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