(YY_SYMBOL_PRINT): Append a newline, for consistency

(YY_SYMBOL_PRINT): Append a newline, for consistency
with the other templates, and to fix bogus run-on messages such
as the one reported at the end of
<http://lists.gnu.org/archive/html/help-bison/2005-07/msg00040.html>.
All callers changed to avoid the newline.
(yyprocessOneStack): Output two lines rather than one, to accommodate
the above change.  This changes the debug output format slightly.