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* ConstraintsIntersection.isSuperTypeOf() and
ConstraintsIntersection.hasConstraint() implemented
* Bugfix to NamedValues initialization code
* +/- operators added to NamedValues objects
* Integer.__abs__() & Integer.subtype() added
* ObjectIdentifier.prettyOut() fixes
* Allow subclass components at SequenceAndSetBase
* AbstractConstraint.__cmp__() dropped
* error.Asn1Error replaced with error.PyAsn1Error