fix pdfbook

pdfbook

@@ -38,12 +38,12 @@ fi
 ##
 if test -z "$shortedge"
 then 
-    exec pdfjam --landscape --suffix book $signature "$@"
+    exec pdfjam --booklet true --landscape --suffix book $signature "$@"
 else
     (kpsewhich everyshi.sty >/dev/null) || {
 	echo "the 'everyshi' package is not installed."; exit 1
     }
-    exec pdfjam --landscape --suffix book $signature \
+    exec pdfjam --booklet true --landscape --suffix book $signature \
 	--preamble '\usepackage{everyshi}
 \makeatletter
 \EveryShipout{\ifodd\c@page\pdfpageattr{/Rotate 180}\fi}