* Fixes Tuple bug (Trac #183) * We really should refactor so that PythonSource and Tuple use the same port    configruation methods
* Fixes Tuple bug (Trac #183)
* We really should refactor so that PythonSource and Tuple use the same port 
  configruation methods

core/modules/tuple_configuration.py:
  - TupleConfigurationWidget.specsFromPorts: new method 
      (copied from PythonSourceConfigurationWidget)
  - TupleConfigurationWidget.registryChanges: new method
      (copied from PythonSourceConfigurationWidget)
  - TupleConfigurationWidget.updateVistrail: use new registryChanges method


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