* data/glr.c, data/lalr1.cc, data/yacc.cc, doc/bison.texinfo,

* data/glr.c, data/lalr1.cc, data/yacc.cc, doc/bison.texinfo,
src/conflicts.c, src/parse-gram.y, src/tables.c, src/tables.h,
tests/action.at, tests/calc.at, tests/conflicts.at,
tests/cxx-type.at, tests/regression.at:
"parse error" -> "syntax error" for POSIX compatibility.
"parsing stack overflow..." -> "parser stack overflow" so
that code matches Bison documentation.