Check handling of negative values in Maths.round()

changed milestone to %nshmp-lib and -apps improvements

assigned to @jaltekruse

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Maths.round(double value, int scale) defaults to RoundingMode.HALF_UP, which rounds any 5 up to the larger absolute magnitude, or away from zero. "The rounding mode commonly taught at school."

Negative numbers are rounded consistently with positive numbers, in that half-values are rounded away from zero.

In contrast:

• RoundingMode.CEILING rounds towards positive infinity
• RoundingMode.FLOOR rounds towards negative infinity.
• RoundingMode.HALF_EVEN is the method that statistically minimizes cumulative error when applied repeatedly over a sequence of calculations (aka "Banker's rounding"). Analogous to the rounding policy used for float and double Java arithmetic.

mentioned in merge request !135 (merged)

closed with merge request !135 (merged)

mentioned in commit 7a1f724c

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