Add the functionality of JSR-013 Improved Decimal Arithmetic
into the J2SE core.

From JSR-013
The proposed enhancements to the BigDecimal class primarily add floating point arithmetic to the existing class, allowing the use of decimal numbers for general-purpose arithmetic (especially financial and user-centric applications) without the overheads and potential errors resulting from conversions to and from another type. In addition, safe conversion methods are added to protect programmers from inadvertent data loss.



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