(maybe optionally) create "missing" objects on POSKeyError

Registered by Jim Fulton

Now, a POSKeyError (which shouldn't happen :) causes a failure to load teh referring object. Maybe instead (maybe optionally) create a special object for the missing objects, much as we do for broken objects. The missing object should be immutable and it should be impossible to save an object that has a reference to a missing object.

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