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__. 

tectronics/pysal,AlanZatarain/pysal,AlanZatarain/pysal,tectronics/pysal,Alwnikrotikz/pysal,AlanZatarain/pysal,Alwnikrotikz/pysal,Alwnikrotikz/pysal,tectronics/pysal