Parsing reference was forgotten in commit for Q217-025. This solves the
problem with a new token MK_ANYTHING.

* src/driver/parse_smtv2_model_lexer.mll
(parse): Added lexing for all remaining mk*___ record constructs.

* src/driver/parse_smtv2_model_parser.mly
(smt_term): An smt_term can be a reference to a smt_term. It means it can
be (Mk_anything smt_term).

Change-Id: Ib529fee83d16d09266e526ca5fb3c65526addff5