DOCBOOK: Patch to support a variety of paper sizes (print output)

Hello, 
	Attached is a patch to db152.zip, to support different page sizes, 
like A4, A3 etc.. I got the info on page sizes from 

http://www.cl.cam.ac.uk/~mgk25/iso-paper.html

It includes the Ax, Bx and Cx standards.

Regards,
Simos Xenitellis

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