Regression fixed due to pubsub recent modifications

MDANSE/Externals/pubsub/LICENSE_BSD_Simple.txt

MDANSE/Externals/pubsub/RELEASE_NOTES.txt

MDANSE/Externals/pubsub/__init__.py

MDANSE/Externals/pubsub/core/__init__.py

MDANSE/Externals/pubsub/core/arg1/__init__.py

MDANSE/Externals/pubsub/core/arg1/listenerimpl.py

MDANSE/Externals/pubsub/core/arg1/publisher.py

MDANSE/Externals/pubsub/core/arg1/publishermixin.py

MDANSE/Externals/pubsub/core/arg1/topicargspecimpl.py

MDANSE/Externals/pubsub/core/arg1/topicmgrimpl.py

MDANSE/Externals/pubsub/core/callables.py

MDANSE/Externals/pubsub/core/imp2.py

MDANSE/Externals/pubsub/core/itopicdefnprovider.py

MDANSE/Externals/pubsub/core/kwargs/__init__.py

MDANSE/Externals/pubsub/core/kwargs/datamsg.py

MDANSE/Externals/pubsub/core/kwargs/listenerimpl.py

MDANSE/Externals/pubsub/core/kwargs/publisher.py

MDANSE/Externals/pubsub/core/kwargs/publishermixin.py

MDANSE/Externals/pubsub/core/kwargs/topicargspecimpl.py

MDANSE/Externals/pubsub/core/kwargs/topicmgrimpl.py