Attaching lineno to buckets is stupid, since only one copy of each

symbol is kept, only the line of the first occurrence is kept too.
* src/symtab.h, src/symtab.c (bucket): Remove the line member.
* src/reader.c (rline_allocated): Remove, unused.
(symbol_list): Have a `line' member.
(symbol_list_new): New.
(readgram): Use it.
* src/print.c (print_grammar): Output the rule line numbers.
* tests/regression.at (Solved SR Conflicts)
(Unresolved SR Conflicts): Adjust.
Reported by Hans Aberg.

src/symtab.h

@@ -42,9 +42,6 @@ typedef struct bucket
   struct bucket *link;
   struct bucket *next;
 
-  /* The line it was found in. */
-  short line;
-
   /* The key, name of the symbol. */
   char *tag;
   /* Its type. */