WIP: strip it down to a minimal failing example

CMakeLists.txt

include/CMakeLists.txt

include/caosdb/connection.h

include/caosdb/exceptions.h

include/caosdb/info.h

src/CMakeLists.txt

src/caosdb/connection.cpp

src/caosdb/info.cpp

src/caosdbcli.cpp

test/CMakeLists.txt

test/test_authentication.cpp