Bug 293827 fixed - MapKeyColumn does not check for multiple writable mappings

[tware]

https://bugs.eclipse.org/bugs/show_bug.cgi?id=293827

MapKeys that are multiply mapped will now cause a ValidationException to be
thrown.  Also fixed some iteration issues with MapKeys turned up in fixing this bug

ValidationTests have been augmented to test this behavior

Reviewed by Chris Delahunt

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