MOF14 — MOF 1.3 Package should subtype Classifier

In the MOF 1.3 Specification, a Package is not a subtype of Classifier. But
an M2 package does have M1 instances (package extent objects), and the M2
Package defines the type of those M1 objects. Therefore, a Package really
is a Classifier. It is a type. It can be thought of as a component type,
and in that sense a Package should be able to contain behavioral features.
Also, an attribute type that is a Package should be treated as a pointer to
a package extent object.

Recommendation: make Package a subtype of Classifier, or fold Classifier
into GeneralizableElement.