Fix the building of the docs in all formats:

Fix the building of the docs in all formats:
 - legalnotice should be in <bookinfo> (Developer docs)
 - Generate embedded PostScript versions of the PNG files in projdoc/imagefiles
 - Use either the PNG or the EPS images, depending on the desired output format.
 Check CUPS-printing.xml diff for details
(This used to be commit 9992d5452d96508dc5dedc146f62e28d03b53ecc)