Merge branch 'bugfixes-pt-opcua' into 'master'

README.md

tangostationcontrol/VERSION

...tationcontrol/tangostationcontrol/clients/comms_client.py

...tioncontrol/tangostationcontrol/clients/tcp_replicator.py

tangostationcontrol/tangostationcontrol/common/asyncio.py

...tationcontrol/devices/base_device_classes/lofar_device.py

tangostationcontrol/test/clients/test_opcua_client.py

tangostationcontrol/test/common/test_asyncio.py

...rol/test/devices/base_device_classes/test_lofar_device.py