[Zope3-dev] Heads up: zope.app.intid and zope.app.keyreference are now optional

[Jim Fulton]

In preparation for the 3.1 release, I made these packages (as
well as zope.app.observable and zope.app.schema) optional and thus
configured vie package includes.  If you have an instance that
uses these, you will need to add package includes for these.

Jim

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