RFR (JAXP): 8037259: Xerces Update: XPointer update

[David Li]

Hi,

This is an update from Xerces XPointer.  For details, please refer to: 
https://bugs.openjdk.java.net/browse/JDK-8037259.

Webrevs: http://cr.openjdk.java.net/~dli/8037259/webrev/

Existing tests: JAXP SQE and unit tests passed.  No new tests were added 
because most of the changes are minor and do not add any new 
functionality.  Changes in ElementSchemePointer.java are already covered 
in JAXP unit test xinclude/Bug6794483Test.java.

Thanks,
David