%expext was not functioning at all.

* src/conflicts.c (expected_conflicts): Set to -1.
(conflict_report): Use ngettext.
(conflicts_print): Check %expect and make its violation an error.
* doc/bison.texinfo (Expect Decl): Adjust.
* configure.in (AM_GNU_GETTEXT): Ask for ngettext.
* tests/regression.at (%expect not enough, %expect right)
(%expect too much): New.

doc/bison.info

@@ -31,115 +31,115 @@ instead of in the original English.
 
 Indirect:
 bison.info-1: 1313
-bison.info-2: 50689
-bison.info-3: 100579
-bison.info-4: 147579
-bison.info-5: 197449
+bison.info-2: 50690
+bison.info-3: 100580
+bison.info-4: 147602
+bison.info-5: 197472
 
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 (Indirect)
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-Node: Language and Grammar31988
-Node: Grammar in Bison37004
-Node: Semantic Values38928
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-Node: Locations Overview42218
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-Node: RPN Calc49715
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-Node: Rpcalc Rules52276
-Node: Rpcalc Input54076
-Node: Rpcalc Line55537
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-Node: Rpcalc Lexer58597
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-Node: Simple Error Recovery67306
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-Node: Ltcalc Decls69925
-Node: Ltcalc Rules70834
-Node: Ltcalc Lexer72895
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+Node: Introduction8968
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+Node: Semantic Values38929
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+Node: Ltcalc Decls69926
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+Node: Mystery Conflicts170163
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+Node: VMS Invocation197472
+Node: Table of Symbols198256
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+Node: Copying This Manual212528
+Node: GNU Free Documentation License212737
+Node: Index232602
 
 End Tag Table