Merge branch 'f-files' into f-consolidation

include/CMakeLists.txt

include/caosdb/file_transmission/Client.h

include/caosdb/file_transmission/FileError.h

include/caosdb/file_transmission/FileLock.h

include/caosdb/file_transmission/FileReader.h

include/caosdb/file_transmission/FileWriter.h

include/caosdb/file_transmission/download_request_handler.h

include/caosdb/file_transmission/file_error.h

include/caosdb/file_transmission/file_reader.h

include/caosdb/file_transmission/file_writer.h

...e/caosdb/file_transmission/register_file_upload_handler.h

include/caosdb/file_transmission/upload_request_handler.h

include/caosdb/handler_interface.h

include/caosdb/transaction_handler.h

include/caosdb/unary_rpc_handler.h

src/CMakeLists.txt

src/caosdb/file_transmission/Client.cpp

src/caosdb/file_transmission/FileReader.cpp

src/caosdb/file_transmission/FileWriter.cpp

src/caosdb/file_transmission/download_request_handler.cpp