Report rules which are never reduced by the parser: those hidden

by conflicts.
* src/LR0.c (save_reductions): Don't make the final state too
different: save its reduction (accept) instead of having a state
without any action (no shift or goto, no reduce).
Note: the final state is now a ``regular'' state, i.e., the
parsers now contain `reduce 0' as default reduction.
Nevertheless, since they decide to `accept' when yystate =
final_state, they still will not reduce rule 0.
* src/print.c (print_actions, print_reduction): Adjust.
* src/output.c (action_row): Track reduced rules.
(token_actions): Report rules never reduced.
* tests/conflicts.at, tests/regression.at: Adjust.

src/LR0.c

@@ -282,11 +282,6 @@ save_reductions (state_t *state)
   int count = 0;
   int i;
 
-  /* If this is the final state, we want it to have no reductions at
-     all, although it has one for `START_SYMBOL $end .'.  */
-  if (final_state && state->number == final_state->number)
-    return;
-
   /* Find and count the active items that represent ends of rules. */
   for (i = 0; i < nritemset; ++i)
     {