GetDIBits(): Handle Bitfields properly [try 2]

[Michael Kaufmann]

Changelog:

GetDIBits():
   - Don't set the bitfields if biBitCount == 0 (this was a memory 
corruption bug)
   - Support the BI_BITFIELDS compression mode by setting bitfield masks 
that use the same bits as the BI_RGB compression mode (Windows does this 
too on my system)
   - Check the input values in the BITMAPINFO structure (width, height,
planes, and compression mode must be valid if biBitCount != 0)
   - 15 is no valid bit count for GetDIBits()
   - Add new tests


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