- Remove singular key names from JSON schema.
- Align the property tree created by `FairMQSuboptParser` with the format required by the main parser (plural names).
- Fix `--print-options` to print all options (not only those that have their value set).
- remove XML parser (outdated and unused).
- various code cleanup.
Standard FairRoot is running all the different analysis tasks within one process. FairMQ (Message Queue) allows starting tasks on different processes and provides the communication layer between these processes.