Calc normally displays a trailing decimal point for floats with no
fractional part, like '12.'. Some uses require at least one digit
after the point; add the governing variable calc-digit-after-point.
* lisp/calc/calc.el (calc-digit-after-point): New variable.
(math-format-number): Use it.
* test/lisp/calc/calc-tests.el (calc-display-digit-after-point):
New test.
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