[OpenJDK 2D-Dev] RFR: 8149816: TIFFField#getValueAsString result is unexpected for RATIONAL and SRATIONAL types (when modulo is 0)

[Brian Burkhalter]

Please review at your convenience:

Issue:	https://bugs.openjdk.java.net/browse/JDK-8149816
Patch:	http://cr.openjdk.java.net/~bpb/8149816/webrev.00/

Summary:
1) Verified that the extant behavior is consistent with both the tiffdump and tiffinfo tools from the standard libtiff library.
2) Updated the specification of getValueAsString() to clarify the behavior when the type is [S]RATIONAL and the numerator is an integral multiple of the denominator.

Thanks,

Brian