Summary: Update specification to match implementation.
Reviewed-by: darcy
Contributed-by: NBrian Burkhalter <brian.burkhalter@oracle.com>

6469160: (fmt) general (%g) formatting of zero (0.0) with precision 0 or 1 throws ArrayOutOfBoundsException
Summary: For zero value ensure than an unpadded zero character is passed to Formatter.addZeros()
Reviewed-by: iris, darcy
Contributed-by: NBrian Burkhalter <brian.burkhalter@oracle.com>

Reviewed-by: darcy, weijun

Summary: throw appropriate exception when necessary
Reviewed-by: alanb

Summary: Correct the wrong calculation of "precision" in certain circumstances.
Reviewed-by: darcy, alanb