Fix bug to run parameterized tests in TestCommandF0
Fix bug to run parameterized tests in TestCommandF0

* When the tests were rearranged, the @parameterize decorator was left
  off.  So put it back in for class TestCommandF0
* The @parameterize decorator is not needed for class TestCommandIO,
  since that class has no parameterized tests.  So delete the decorator.

voicesauce/opensauce-python,voicesauce/opensauce-python,voicesauce/opensauce-python