Merge branch 'f-remove-unique-result' into f-files

.gitlab-ci.yml

include/caosdb/configuration.h

include/caosdb/entity.h

include/caosdb/logging.h

include/caosdb/transaction.h

proto

src/caosdb/entity.cpp

src/caosdb/logging.cpp

src/caosdb/transaction.cpp

test/test_entity.cpp

test/test_transaction.cpp