Log Message:
Update to version 7.48 (dcraw.c revision 1.274).

changes:
1.274
Fixed the Kodak NC2000F, and improved the Minolta DYNAX 5D.
Correctly flip NEF files that Nikon Capture has modified.
1.273
Support Adobe DNG version 1.1.0.0.
1.272
Added the Leaf Aptus 17.
1.271
Fixed gcc warning.
1.270
Fixed serious problems with the Imacon Ixpress.
Moved most verbose messages out of main().
1.269
Various changes regarding headerless raw photos.
Support the Nikon D50 with camera white balance.
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revision 1.268
Added AVT and ISG cameras.