- 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- remove XML parser (outdated and unused).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.
A parser implementation for FairMQ channel properties.
The parser handles a comma separated key=value list format by using the
getsubopt function of the standard library.
The option key '--channel-config' can be used with the list of key/value
pairs like e.g.
--channel-config name=output,type=push,method=bind
