nitcc: Makefile add nitcc.sablecc in some rule arguments

Signed-off-by: Jean Privat <jean@pryen.org>
nitcc: add Automation::tag_acept and Automaton::absorb

Signed-off-by: Jean Privat <jean@pryen.org>
nitcc: fix print with nullable

Error messages require a better approach.

Signed-off-by: Jean Privat <jean@pryen.org>
nitcc: fix visibility of Nelem::set_elem

Signed-off-by: Jean Privat <jean@pryen.org>
nitcc: add Automaton::clear_tag

Signed-off-by: Jean Privat <jean@pryen.org>
nitcc: add And and Except

Signed-off-by: Jean Privat <jean@pryen.org>
nitcc: update tests for And and Except

Signed-off-by: Jean Privat <jean@pryen.org>