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39. RoundingMode.HALF_EVEN

This rounding mode is analogous to the rounding policy used for float and double arithmetic in Java.
Same as RoundingMode.HALF_UP, except when the rounding digit is 5:
- it will round down if the digit to the left of the 5 is even
- it will round up if the digit to the left of the 5 is odd

For example, after


    BigDecimal bdHalfEven = bdValue.setScale(0, RoundingMode.HALF_EVEN);

the rounding will be


  Input      Rounded value
  -----      -------------
    2.5  ->  2 // because 2 is even, round down
    7.5  ->  8 // because 7 is odd, round up

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