Disabling irods authentication is no longer required (one can sue local storage for testing puroposes).
path sanitation for local paths.

 Remaining fix: parent paths
path sanitation for local paths. New approach. Test added
path sanitation for local paths. One more try after reading the documentation about os.path.join
restoring irods config.

clean-up of the irodsstorage. We shall not expose internal information to the users (e.g. about the paths). This has potential security implications (XSS out of the box with the previous implementation).