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lalr1.cc used to support yyo, but not yyoutput. Support both, but document only yyoutput (at least until there is some consensus on this). * data/c.m4 (yy_symbol_value_print): Also support yyo. * data/glr.cc (yy_symbol_value_print_): Support both yyo and yyoutput. * data/lalr1.cc: Also support yyoutput. * doc/bison.texinfo: Explicitly use yyoutput in the examples. * examples/mfcalc/mfcalc.test: Test the -p option.