rename prolog_parser_rebis to prolog_parser

also remove remaining extern crate statements that slipped through earlier

src/machine/machine_state_impl.rs

@@ -1,6 +1,6 @@
-use prolog_parser_rebis::ast::*;
-use prolog_parser_rebis::tabled_rc::*;
-use prolog_parser_rebis::{clause_name, perm_v, temp_v};
+use prolog_parser::ast::*;
+use prolog_parser::tabled_rc::*;
+use prolog_parser::{clause_name, perm_v, temp_v};
 
 use crate::clause_types::*;
 use crate::forms::*;