digikam from trunk: use new dcraw thumbnail extraction method to render album items content and camera items content about all RAW files. This way will be always the more performant instead to use dcraw::parse method from digiKam core. Note that DCR raw files from Kodak camera works fine in this case.

IMPORTANT : you need to use last dcraw 8.21, else thumbs render can take a while !!!

BUG: 128283