Reviewed-by: darcy, ahgross, rhalade

Reviewed-by: kvn, mdoerr

Summary: Modify MutableBigInteger.divideAndRemainderBurnikelZiegler() to copy the instance (this) to a new MutableBigInteger to use as the dividend.
Reviewed-by: darcy
Contributed-by: robbiexgibson@yahoo.com

Reviewed-by: kvn, mdoerr

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

8021203: BigInteger.doubleValue/floatValue returns 0.0 instead of Infinity
8021204: Constructor BigInteger(String val, int radix) doesn't detect overflow
8022780: Incorrect BigInteger division because of MutableBigInteger.bitLength() overflow
Summary: Prevent construction of overflowed BigIntegers.
Reviewed-by: bpb, darcy, psandoz
Contributed-by: NDmitry Nadezhin <dmitry.nadezhin@oracle.com>

8022180: BigInteger Burnikel-Ziegler quotient and remainder calculation assumes quotient parameter is zero
Summary: Clear the quotient in divideAndRemainderBurnikelZiegler() if the divisor is larger than the dividend.
Reviewed-by: alanb, bpb
Contributed-by: NTimothy Buktu <tbuktu@hotmail.com>

Summary: Some minor cleanup to adhere better to Java coding conventions.
Reviewed-by: darcy
Contributed-by: NBrian Burkhalter <brian.burkhalter@oracle.com>

Summary: Implement Burnickel-Ziegler division algorithm in BigInteger
Reviewed-by: bpb, martin
Contributed-by: NTim Buktu <tbuktu@hotmail.com>

Reviewed-by: darcy
Contributed-by: sergey.kuksenko@oracle.com

Reviewed-by: darcy, weijun

Reviewed-by: darcy