This is done to support both Pythonic and Qt style method names, i.e.
both "isNextEnabled" and "is_next_enabled" is ok in a Python module.
Also better documentation in PythonQtViewStep, and stub for
setConfigurationMap.
Finally, proper handling of PythonQtViewStep Python-facing basewidget:
with this change, a call to PQVS::widget() only triggers a widget
relayout if it's necessary, and leaves it alone otherwise.
