Added partial implementation of isSameNode() method, to keep Saxon transforms that use the document() method from barfing on a "not implemented" throw exception in some very specific xslt usage scenarios.
Added partial implementation of isSameNode() method, to keep Saxon transforms that use the document() method from barfing on a "not implemented" throw exception in some very specific xslt usage scenarios.

svn path=/trunk/eXist/; revision=7514

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