more work on Error

broker/src/hidra2_broker/database/mongodb.go

common/cpp/CMakeLists.txt

common/cpp/include/common/error.h

common/cpp/include/system_wrappers/io.h

common/cpp/src/system_io/system_io.cpp

common/cpp/src/system_io/system_io_linux.cpp

common/cpp/src/system_io/system_io_windows.cpp

examples/worker/getnext_broker/getnext_broker.cpp

examples/worker/process_folder/process_folder.cpp

tests/system_io/CMakeLists.txt

tests/system_io/read_file_content/CMakeLists.txt

tests/system_io/read_folder_content/CMakeLists.txt

tests/system_io/read_folder_content/cleanup_linux.sh

tests/system_io/read_folder_content/cleanup_windows.bat

tests/system_io/read_folder_content/read_folder_content.cpp

tests/system_io/read_folder_content/setup_linux.sh

tests/system_io/read_folder_content/setup_windows.bat

worker/api/cpp/CMakeLists.txt

worker/api/cpp/src/folder_data_broker.cpp

worker/api/cpp/src/http_client.cpp