Merge branch 'f-debug-build' into 'f-release-0.1'

.docker/Dockerfile

.gitlab-ci.yml

doc/README_SETUP.md

include/caosdb/authentication.h

include/caosdb/configuration.h

include/caosdb/constants.h.in

include/caosdb/entity.h

include/caosdb/logging.h

include/caosdb/protobuf_helper.h

include/caosdb/transaction.h

src/caosdb/file_transmission/download_request_handler.cpp

src/caosdb/logging.cpp

src/caosdb/protobuf_helper.cpp

src/caosdb/status_code_description.cpp

src/caosdb/transaction.cpp

test/CMakeLists.txt

test/test_connection.cpp

test/test_data_type.cpp

test/test_entity.cpp

test/test_protobuf.cpp