- we implemented the hierarchy and sort names declaration in text parser

- we implemented the hierarchy and sort names declaration in text parser
- we implemented a basic taxonomy for the entities in the text parser
- we fixed the visibility rules in the text-to-crg transformation
- we corrected a bug in the text-to-crg transformation (a continuation was not called)
- we removed the hierarchy parameter from the type checker status
- we created an directory with the examples we can typecheck
- we changed the semantics of the -r command-line option