Fix for doctest failures in diagnostics module. We think the test setup does not recognize statements in __main__. 
Fix for doctest failures in diagnostics module. We think the test setup does not
recognize statements in __main__. 

google-code-export/pysal,pombreda/pysal,pombreda/pysal,google-code-export/pysal,google-code-export/pysal,pombreda/pysal,pombreda/pysal,google-code-export/pysal