Suggested bitmap coords resolve

[P. Christeas]

This patch resolves some trouble with bitmap drawing (DIBs), when the y-axis 
uses negative mapping (LPtoDP). This makes Aut0CaD r. 14 usable under wine.
Please note bug #720, which was closed by this patch and note any problems w. 
the patch.

The second patch is a simple suggestion about a NULL handler. IMHO all NULLs 
coming from external programs-libs should be handled in a prog. In that case, 
a NULL causes no harm, but I guess my 'early test' may introduce a minor 
speedup.
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