CHANGES TO CORE PRODUCT
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Support for ORDER BY ... DESC was missing in 5.1.0, you will need to apply the patch available at:
* http://trac.vtiger.com/cgi-bin/trac.cgi/ticket/6635 - Should be available in 5.2.0

Support for overriding GetRelatedList global API
* http://trac.vtiger.com/cgi-bin/trac.cgi/ticket/6768 - Should be available in 5.2.0