Consider "\%" operator in Calc to compute both the quotient and remainder

[rlwhitcomb]

The underlying methods in BigDecimal, etc. are already there, and it might save a bit of time and code to do both at once if needed (and they often are used together).

[rlwhitcomb]

There is something VERY odd about our remainder / mod result with fractions.

Quotient / remainder should be x = yq + r when x ÷ y but since dividing fractions is just multiplication by the inverse, r will always be zero. If x == a/b and y == c/d, so a/b ÷ c/d = a×d / b×c so q = ad / bc and then yq is c/d × ad / bc or ca / bc or just a/b, in other words x. So r must always be 0 when dividing fractions.

I don't know where I got the "formula" for remainder inside BigFraction, but it seems to be bogus...