+** C++ skeletons improvements
+
+*** parser header (%defines) is no longer mandatory (lalr1.cc)
+
+ In which case, if needed, the support classes are defined in the generated
+ parser, instead of additional files (location.hh, position.hh and
+ stack.hh).
+
+*** locations are no longer mandatory (lalr1.cc, glr.cc)
+
+ Both lalr1.cc and glr.cc no longer require %location.
+
+*** syntax_error exception (lalr1.cc)