8029501: BigInteger division algorithm selection heuristic is incorrect 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

8029514: java/math/BigInteger/BigIntegerTest.java failing since thresholds adjusted in 8022181 Summary: Ensure the value returned by getLower() is unsigned. Reviewed-by: darcy

8029264: [doclint] more doclint and tidy cleanup Reviewed-by: alexsch, serb, malenkov

8028564: Concurrent calls to CHM.put can fail to add the key/value to the map Reviewed-by: psandoz, chegar, alanb Contributed-by: Doug Lea <dl@cs.oswego.edu>