[eclipselink-dev] Fix for Bug 403981 - Converter is not applied on JPQL

[Tom Ware <tom.ware@xxxxxxxxxx>]

https://bugs.eclipse.org/bugs/show_bug.cgi?id=403981

Fix checked into master.  When 2.5.1 opens we will check it in there as well.

Fix adds a query hint that allows the converter to be applied when MIN or MAX is 
in the query.

Currently the default behavior for MIN and MAX is to return the value from the 
DB and require the query hint to apply the converter.  We chose this behavior so 
as not to regress anyone who is depending on the functionality prior to this bug 
fix.

Reviewed by Guy Pelletier

Tested with Core and JPA LRG

Added test to InheritanceTestSuite (due to presence of an appropriate mapping)