Fix for printouts without margins

[David Faure]

After my wife hit that bug yet again, I decided it was time to fix it :)

When printing from KHTML (a webpage or a mail), it is quite common to end up with
a printout that has no margins at all - i.e. the text tries to start from the top and left borders
of the physical page, and the printer eats a few characters due to that.

The reason is that the PPD file for the printer says
*ImageableArea A4/A4: "0 0 595 842"
*PaperDimension A4/A4: "595 842"
i.e. no margins at all.
(Of course people who use a PPD which specifies margins don't see this bug - lucky them).

I think kdeprint should ignore that and let qt use default margins in such a case.
Applications which use setFullPage(true), like kword, can still print in the corners
as one would expect; the change seems to only affect code that use setFullPage(false),
like KHTML.

Any objections to me committing the attached patch?

-- 
David Faure, faure at kde.org, sponsored by Trolltech to work on KDE,
Konqueror (http://www.konqueror.org), and KOffice (http://www.koffice.org).
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