* Rename method and make private
* Use is_iterable, combine transformations
* Remove unused return_values from network modules
* Improve docstrings in new functions
* Add new PASS_VAR
* Add unit tests for list_no_log_values
* Fix unit tests for Python 2.6
Refinements:
- return legal_inputs and update class properties
- remove redundant arguments from method and handle in caller
- add better exception types to method
* Add unit tests for handle_aliases