Bug 724846 - fix ISO A*,B*,JIS B* paper size

ISO paper size unit is mm. But dia`s paper size have under mm number.
So the pdf have abnormal size which exported by dia, on adobereader or
some viewers.

https://bugzilla.gnome.org/show_bug.cgi?id=724846

Signed-off-by: Hans Breuer <hans@breuer.org>