* src/getargs.h, src/getargs.c (trace_e, trace_args, trace_types):

Add support for --trace=skeleton.
* src/scan-skel.l: %option debug.
Scan strings of non-@ or n instead of character by character.
(scan_skel): Handle trace_skeleton.
(QPUTS): New.
(@output_parser_name@, @output_header_name@): ``Restore'' their
support (used to be M4 macros).
* data/yacc.c: Quote larger chunks, a la glr.c.
* data/lalr1.cc: Likewise.
The header guards are no longer available, so use some other
string than `YYLSP_NEEDED'.

src/getargs.h

@@ -48,6 +48,7 @@ enum trace_e
     trace_automaton = 1 << 6,
     trace_grammar   = 1 << 7,
     trace_time      = 1 << 8,
+    trace_skeleton  = 1 << 9,
     trace_all       = ~0
   };
 extern int trace_flag;