Do not store references in operator exceptions
Set python path as test property
Merge remote-tracking branch 'github/master'
Fix library path for python tests in debian build
Add property factory to stream
Add operator kernels to stream (instead of operators)
Fix unit tests
Change signature of removeOperator(), check status before setting factory
Factory is thread-safe
Pass factory pointer instead of reference to XML reader
Deactivate VideoCapture test
Deactivate tests which crash because of zip bug
Delete operator in remove member of stream
Add framework for hiding operators and threads
Move all mutex handles to a common file
Add hide/show tests to stream test
Implement hide/show functions in stream
Stream deletes hidden operators and threads
Clean up python interface
Deactivate all problematic tests