#32 - Implementation completed with rich unit tests coverage.
- manual.md contains a simple example of the new feature
- support for undocumented `\[0-3]` for the requester of the feature ;-)
- full unit tests coverage of the new functionality
- refactor of the parser to allow more flexible syntax and be able to detect more errors
- introduced many new errors recognized by the parser
- Implementation with full coverage of unit tests
- Documentation update with details about priorities (as an advanced feature, only in manual.md, not in README.md)