More tests

include/caosdb/data_type.h

include/caosdb/entity.h

include/caosdb/transaction.h

include/caosdb/utility.h

include/ccaosdb.h

requirements.txt

src/caosdb/status_code_description.cpp

src/caosdb/utility.cpp

src/ccaosdb.cpp

src/ccaosdbcli.c

test/test_data_type.cpp

test/test_entity.cpp

test/test_value.cpp