Pessimize the code to simplify it: from now on, all the states

have a valid SHIFTS, which NSHIFTS is possibly 0.
* src/LR0.c (shifts_new): Be global and move to..
* src/state.c, src/state.h: here.
* src/conflicts, src/lalr.c, src/output.c, src/print.c,
* src/print_graph: Adjust.

src/state.h

@@ -1,5 +1,5 @@
 /* Type definitions for nondeterministic finite state machine for bison,
-   Copyright 1984, 1989, 2000 Free Software Foundation, Inc.
+   Copyright 1984, 1989, 2000, 2001 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -124,6 +124,9 @@ typedef struct shifts
   (shifts *) xcalloc ((unsigned) (sizeof (shifts) 			\
                                   + (Nshifts - 1) * sizeof (short)), 1)
 
+shifts * shifts_new PARAMS ((int n));
+
+
 /* What is the symbol which is shifted by SHIFTS->shifts[Shift]?  Can
    be a token (amongst which the error token), or non terminals in
    case of gotos.  */