[eclipselink-dev] Bug fixes 270464 and 270483

["Denise Smith" <denise.mahar@xxxxxxxxxx>]

Fixes have been checked in for these bugs

https://bugs.eclipse.org/bugs/show_bug.cgi?id=270464
JAXB2.1 ConversionException converting to BigInteger
Reviewed by Blaise Doughan

https://bugs.eclipse.org/bugs/show_bug.cgi?id=270483
JAXB2.1 generated direct collection mappings to attributes should be
setUsesSingleNode(true)
Reviewed by Matt MacIvor