TEIIDDES-627 File > Save As action results in validation errors in new model if model is virtual and folder location different than original location.

TEIIDDES-1601 Error Setting Extension Properties When Creating Table In A Virtual Model
TEIIDDES-1602 Add Transformation And Union Source Action Diagram Toolbar Buttons Do Not Work
Added a rebuild imports call to the model copy command and that fixed the model save as issues. Fixed some focus selection issues in the diagram toolbar actions.
Now committed the changes in the submodeles. See these pull requests:
https://github.com/Teiid-Designer/teiid/pull/3
https://github.com/Teiid-Designer/teiid/pull/4