[Collections][Patch][Submit] PredicateUtils and PredicateCollections

[Stephen Colebourne <sc...@eurobell.co.uk>]

This link contains the code for the PredicateUtils and PredicateCollections
classes:
http://www.scolebourne.eurobell.co.uk/Predicates.zip

This change:
- separates the 8 wrapper collections from the standard Predicate
implementations.
- patches a bug in the original checkin where a class was public that should
not have been.
- adds two new Predicate implementations, 'is null' and 'is not null'.
- includes are test classes, which I don't think got handed in first time
around.

There is now plenty of room in the source file to add more standard
Predicate implementations if required.
PredicateUtils is supplied 'whole' as the version on the CVS would be
completely replaced by the new version.

Hopefully, this will prove an acceptable update  ;-)

Stephen


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