pylint -E fixed for pipelines.py and related
pylint -E fixed for clangcommon and related
fix one last pipelines.py pylint error about defining Pipelined self._parent in __init__

Make Pipedlined into a proper python mixin class by making it
obey cooperative multiple inheritance. Involves putting the mixin
before the Operator base classes in subclasses.

see
http://stackoverflow.com/questions/6098970/are-mixin-class-init-functions-not-automatically-called-in-python
update TODO in pylint test