Release Note: Restore Behavior of java.math.BigDecimal.movePointLeft() and movePointRight() on a Zero Argument

When these methods are invoked with a zero argument on a target with a negative _scale_, they return a result which is numerically the same as the target, but with a different _unscaled value_ and _scale_.

In earlier releases, they returned a result with the same _unscaled value_ and _scale_, which was against the specification.

The behavior is unchanged when the target has a non-negative _scale_ or when the argument is not zero.