Default backend for the
EnvIO monad. This backend uses the filesystem
as storage and UUIDs for scenario instances (supposes that UUID collision
Parameters, logfiles, and result data all are stored in a unique directory named .<scenario-name>uuid
Results are individual files in this directory. There is no namespacing hence avoid the following names: 'execution.json', 'execution-log.txt', and 'execution-log.xml'. These three files are the scenario execution metadata and logs.