Reviewed-by: mchung

Reviewed-by: erikj

Reviewed-by: alanb, chegar
Contributed-by: roger.riggs@oracle.com

Summary: Change Burnikel-Ziegler division heuristic to require that the dividend int-length exceed that of the divisor by a minimum amount.
Reviewed-by: darcy

Summary: Ensure the value returned by getLower() is unsigned.
Reviewed-by: darcy

Reviewed-by: alexsch, serb, malenkov

Reviewed-by: psandoz, chegar, alanb
Contributed-by: NDoug Lea <dl@cs.oswego.edu>

Reviewed-by: wetmore, ihse