Checked in: JPQL updates for COALESCE, NULLIF, and INDEX

Checked in JPQL updates

Changes attached here:

https://bugs.eclipse.org/bugs/show_bug.cgi?id=249224

Reviewed by Chris Delahunt

Checked in now to be available for milestone build

A minor update is still required for validation of coalesce and the
documentation at the site below will be updated

http://wiki.eclipse.org/EclipseLink/Development/JPA_2.0/jpql
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