Fix division rounding #330
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When the intermediate calculation of `a.div(b, 4)` is `0.123000000 000000000 ...`, Round up result may be 0.1230 or 0.1231 depend on remainder of the division. Treat the calculation as `0.123000000 000000001` in such case to calculate rounding correctly.
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Fixes #328
Depend on #329
Rounding needs these two:
remaining digits == zeroThese are some rounding rules:
ROUND_HALF_UP:
next_digit>=5ROUND_HALF_DOWN:
next_digit>5 || (next_digit==5 && !remaining_zero)ROUND_UP:
next_digit>0 || !remaining_zeroCurrently, BigDecimal_div2 only uses next few digits.
This pull request adds extra information about remaining_digits before rounding.