Switch to side-by-side view

--- a/src/doc/user/Makefile
+++ b/src/doc/user/Makefile
@@ -45,7 +45,7 @@
             "${XSLDIR}/html/chunk.xsl" $<
 
 usermanual.pdf: usermanual.xml
-	dblatex $<
+	dblatex --xslt-opts="--xinclude" -tpdf $<
 
 UTILBUILDS=/home/dockes/tmp/builds/medocutils/
 recoll-conf-xml: