### Calc: fix business days calculation (bug43677)

The calculation of business days was broken in 2012 (probably 310e60d9 or thereabouts) when the date representation changed epoch so that Jan 1, 1 AD became day number 1 instead of 0. Repair this, along with an unrelated bug that prevented arbitrary holiday weekdays from working. Reported by Aaron Zeng. * lisp/calc/calc-forms.el (math-to-business-day) (math-from-business-day): Correct calculation of weekdays using Calc's current (Rata Die) chronology. Modify loop condition to cope with odd sets of holiday weekdays. * test/lisp/calc/calc-tests.el (calc-business-days): New test.

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