diagnostics: "-Werror -Wno-error=foo" must not emit errors

Currently "-Werror -Wno-error=foo" still turns "foo" warnings into errors.
Reported by Alexandre Duret-Lutz.
See http://lists.gnu.org/archive/html/bug-bison/2013-09/msg00015.html.

* src/complain.c (errority, errority_flag): New.
(complain_init): Initialize the latter.
(warning_argmatch): Extract the loop iterating on the flag's bits.
Set and unset errority_flag here.
(warnings_argmatch): -Wno-error is not the same as -Wno-error=everything:
we must remember if category foo was explicitly turned in an error/warning
via -W(no-)error=foo.
(warning_severity): Use errority_flag.

* tests/input.at (Symbols): Just check --yacc, not -Wyacc, that's the
job of tests on -W.
(-Werror is not affected by -Wnone and -Wall): Rename as...
(-Werror combinations): this.
Tests more combinations of -W, -W(no-)error, and -W(no-)error=foo.
* tests/local.at (AT_BISON_CHECK_WARNINGS): Don't expect -Werror
to turn runs that issue warnings into runs with errors, as the
warnings might be enforced as warnings by -Wno-error=foo, in which
case -Werror does not change anything.

* doc/bison.texi (Bison Options): Try to be clearer about how
-W(no-)error and -W(no-)error=foo interact.

tests/local.at

@@ -635,9 +635,12 @@ m4_define([AT_BISON_CHECK_],
 # ----------------------------------------------------------
 # Check that warnings (if some are expected) are correctly
 # turned into errors with -Werror, etc.
+#
+# When -Wno-error is used, the rules are really different, don't try.
 m4_define([AT_BISON_CHECK_WARNINGS],
 [m4_if(m4_bregexp([$4], [: warning: ]), [-1], [],
-      [m4_null_if([$2], [AT_BISON_CHECK_WARNINGS_($@)])])])
+       m4_bregexp([$1], [-Wno-error=]), [-1],
+                  [m4_null_if([$2], [AT_BISON_CHECK_WARNINGS_($@)])])])
 
 m4_define([AT_BISON_CHECK_WARNINGS_],
 [[# Defining POSIXLY_CORRECT causes bison to complain if options are