Merge branch 'master' into TMSS-175

.gitlab-ci.yml

CMake/FindCurl.cmake

CMake/FindCurlCpp.cmake

CMake/FindJsonCpp.cmake

CMake/variants/variants.lcs157

Docker/lofar-base/Dockerfile.tmpl

Docker/lofar-ci/Dockerfile_ci_base

Docker/lofar-ci/Dockerfile_ci_mac

Docker/lofar-ci/Dockerfile_ci_rtcp

Docker/lofar-outputproc/Dockerfile.tmpl

Docker/lofar-pipeline/Dockerfile.tmpl

Docker/lofar-pipeline/_Dockerfile_ABI0.tmpl_

Docker/lofar-subbandtbbwriter/Dockerfile.tmpl

LCS/Messaging/python/messaging/messagebus.py

LCS/Messaging/python/messaging/test/t_RPC.py

LCS/Messaging/python/messaging/test/t_messagebus.py

LCS/PyCommon/test_utils.py

.../LTAIngestAdminServer/test/t_ingestjobmanagementserver.py

MAC/APL/CASATools/include/CASATools/CasaConverter.h

MAC/APL/CASATools/src/CasaConverter.cc