The model import wizard should indicate what db tables match in the model, are similar, and not yet imported.

[abrougher]

When browsing tables to import into a model, tables could be marked to indicate either:

1. The table matches an entity in the model.
2. The entity name matches but the columns are different. (Happens when the db schema changes after an import).
3. The entity does not exist in the current model.

Ideally this status would be it's own column that could be filtered on and/or sorted.

[abrougher]

This should also allow model attributes that no longer exist in the db to be removed.