Add known citation packages to LaTeXFeatures:

- achicago
  - apacite
  - apalike
  - astron
  - authordate
  - chicago
  - harvard
  - mslapa
  - named

This allows these citation packages can be Required by the document layout.
LyX handles the package ordering, loading any of these packages before natbib
when both are required by the document layout. For example, apacite can be
used with or without natbib.

The package achicago isn't compatible with natbib out-of-the-box,
but the following compatibility code makes it work:

\usepackage{achicago}
\let\achicagobib\thebibliography
\usepackage[authoryear]{natbib}
\let\thebibliography\achicagobib
\let\UnexpandableProtect\protect
\let\SCcite\astroncite

lib/chkconfig.ltx

@@ -269,10 +269,15 @@
 
 %%% Packages
 \TestPackage{accents}
+\TestPackage{achicago}
 \TestPackage{algorithm}
 \TestPackage{amstext}
+\TestPackage{apacite}
+\TestPackage{apalike}
 \TestPackage[arabic.ldf]{arabi}
 \TestPackage{array}
+\TestPackage{astron}
+\TestPackage{authordate1-4}
 \TestPackage{babel}
 \TestPackage{bibtopic}
 \TestPackage{bidi}
@@ -283,6 +288,7 @@
 \TestPackage{CJKutf8}
 \TestPackage{calc}
 \TestPackage{cancel}
+\TestPackage{chicago}
 \TestPackage{color} % this one should be there if graphics.sty is there.
 \TestPackage{covington}
 \TestPackage{csquotes}
@@ -293,6 +299,7 @@
 \TestPackage{esint}
 \TestPackage{eso-pic}
 \TestPackage{fontspec}
+\TestPackage{harvard}
 \TestPackage{hhline}
 \TestPackage{ifthen}
 \TestPackage{iftex}
@@ -320,7 +327,9 @@
 \TestPackage{mathtools}
 \TestPackage{mhchem}
 \TestPackage[mongolian.ldf]{mongolian}
+\TestPackage{mslapa}
 \TestPackage{multirow}
+\TestPackage{named}
 \TestPackage{natbib}
 \TestPackage{nicefrac}
 \TestPackage{nomencl}

src/LaTeX.cpp

@@ -184,7 +184,7 @@ int LaTeX::run(TeXErrors & terr)
 
 	bool had_depfile = depfile.exists();
 	bool run_bibtex = false;
-	FileName const aux_file(changeExtension(file.absFileName(), "aux"));
+	FileName const aux_file(changeExtension(file.absFileName(), ".aux"));
 
 	if (had_depfile) {
 		LYXERR(Debug::DEPEND, "Dependency file exists");
@@ -694,6 +694,10 @@ int LaTeX::scanLogFile(TeXErrors & terr)
 				   && contains(token, "on page")
 				   && contains(token, "undefined")) {
 				retval |= UNDEF_CIT;
+			} else if (contains(token, "Citation")
+				   && contains(token, "on input line")
+				   && contains(token, "undefined")) {
+				retval |= UNDEF_CIT;
 			}
 		} else if (prefixIs(token, "Package")) {
 			// Package warnings

src/LaTeXFeatures.cpp

@@ -716,6 +716,21 @@ char const * simplefeatures[] = {
 	"tfrupee"
 };
 
+char const * bibliofeatures[] = {
+	// Known bibliography packages (will be loaded before natbib)
+	"achicago",
+	"apacite",
+	"apalike",
+	"astron",
+	"authordate1-4",
+	"chicago",
+	"harvard",
+	"mslapa",
+	"named"
+};
+
+int const nb_bibliofeatures = sizeof(bibliofeatures) / sizeof(char const *);
+
 int const nb_simplefeatures = sizeof(simplefeatures) / sizeof(char const *);
 
 }
@@ -894,6 +909,17 @@ string const LaTeXFeatures::getPackages() const
 	    params_.use_package("esint") != BufferParams::package_off)
 		packages << "\\usepackage{esint}\n";
 
+	// Known bibliography packages (simple \usepackage{package})
+	for (int i = 0; i < nb_bibliofeatures; ++i) {
+		if (mustProvide(bibliofeatures[i]))
+			packages << "\\usepackage{"
+				 << bibliofeatures[i] << "}\n";
+	}
+
+	// Compatibility between achicago and natbib
+	if (mustProvide("achicago") && mustProvide("natbib"))
+		packages << "\\let\\achicagobib\\thebibliography\n";
+
 	// natbib.sty
 	// Some classes load natbib themselves, but still allow (or even require)
 	// plain numeric citations (ReVTeX is such a case, see bug 5182).
@@ -907,6 +933,13 @@ string const LaTeXFeatures::getPackages() const
 		packages << "]{natbib}\n";
 	}
 
+	// Compatibility between achicago and natbib
+	if (mustProvide("achicago") && mustProvide("natbib")) {
+		packages << "\\let\\thebibliography\\achicagobib\n";
+		packages << "\\let\\SCcite\\astroncite\n";
+		packages << "\\let\\UnexpandableProtect\\protect\n";
+	}
+
 	// jurabib -- we need version 0.6 at least.
 	if (mustProvide("jurabib"))
 		packages << "\\usepackage{jurabib}[2004/01/25]\n";