doc: Improve setup for documentation building with FOP

Add a makefile rule for building PDFs with FOP.  Two new build targets
in doc/src/sgml are postgres-A4-fop.pdf and postgres-US-fop.pdf.

Run .fo output through xmllint for reformatting, so that errors are
easier to find.  (The default output has hardly any line breaks, so you
might be looking for an error in column 20000.)

Set some XSLT parameters to optimize for building with FOP.

Remove some redundant or somewhat useless chapterinfo/author
information, because it renders strangely with the FO stylesheet.
Reviewed-by: Álvaro Herrera <alvherre@2ndquadrant.com>

doc/src/sgml/Makefile

@@ -268,12 +268,24 @@ xslthtml-stamp: stylesheet.xsl postgres.xml
 htmlhelp: stylesheet-hh.xsl postgres.xml
 	$(XSLTPROC) $(XSLTPROCFLAGS) $^
 
-%-A4.fo: stylesheet-fo.xsl %.xml
+%-A4.fo.tmp: stylesheet-fo.xsl %.xml
 	$(XSLTPROC) $(XSLTPROCFLAGS) --stringparam paper.type A4 -o $@ $^
 
-%-US.fo: stylesheet-fo.xsl %.xml
+%-US.fo.tmp: stylesheet-fo.xsl %.xml
 	$(XSLTPROC) $(XSLTPROCFLAGS) --stringparam paper.type USletter -o $@ $^
 
+FOP = fop
+XMLLINT = xmllint
+
+# reformat FO output so that locations of errors are easier to find
+%.fo: %.fo.tmp
+	$(XMLLINT) --format --output $@ $^
+
+.SECONDARY: postgres-A4.fo postgres-US.fo
+
+%-fop.pdf: %.fo
+	$(FOP) -fo $< -pdf $@
+
 epub: postgres.epub
 postgres.epub: postgres.xml
 	$(DBTOEPUB) $<
@@ -391,7 +403,7 @@ clean:
 # index
 	rm -f HTML.index $(GENERATED_SGML)
 # XSLT
-	rm -f postgres.xml postgres.xmltmp htmlhelp.hhp toc.hhc index.hhk *.fo
+	rm -f postgres.xml postgres.xmltmp htmlhelp.hhp toc.hhc index.hhk *.fo *.fo.tmp
 # EPUB
 	rm -f postgres.epub
 # Texinfo

doc/src/sgml/geqo.sgml

 <!-- doc/src/sgml/geqo.sgml -->
 
  <chapter id="geqo">
-  <chapterinfo>
-   <author>
-    <firstname>Martin</firstname>
-    <surname>Utesch</surname>
-    <affiliation>
-     <orgname>
-      University of Mining and Technology
-     </orgname>
-     <orgdiv>
-      Institute of Automatic Control
-     </orgdiv>
-     <address>
-      <city>
-       Freiberg
-      </city>
-      <country>
-       Germany
-      </country>
-     </address>
-    </affiliation>
-   </author>
-   <date>1997-10-02</date>
-  </chapterinfo>
-
   <title>Genetic Query Optimizer</title>
 
   <para>

doc/src/sgml/nls.sgml

 <!-- doc/src/sgml/nls.sgml -->
 
 <chapter id="nls">
- <chapterinfo>
-  <author>
-   <firstname>Peter</firstname>
-   <surname>Eisentraut</surname>
-  </author>
- </chapterinfo>
-
  <title>Native Language Support</title>
 
  <sect1 id="nls-translator">

doc/src/sgml/stylesheet-fo.xsl

@@ -6,6 +6,18 @@
 <xsl:import href="http://docbook.sourceforge.net/release/xsl/current/fo/docbook.xsl"/>
 <xsl:include href="stylesheet-common.xsl" />
 
+<xsl:param name="fop1.extensions" select="1"></xsl:param>
+<xsl:param name="tablecolumns.extension" select="0"></xsl:param>
+<xsl:param name="toc.max.depth">3</xsl:param>
+<xsl:param name="ulink.footnotes" select="1"></xsl:param>
+<xsl:param name="use.extensions" select="1"></xsl:param>
+<xsl:param name="variablelist.as.blocks" select="1"></xsl:param>
+
+<xsl:attribute-set name="monospace.verbatim.properties"
+                   use-attribute-sets="verbatim.properties monospace.properties">
+  <xsl:attribute name="wrap-option">wrap</xsl:attribute>
+</xsl:attribute-set>
+
 <!-- Change display of some elements -->
 
 <xsl:template match="command">