Merge

Demosaicing and pre-processing parameters selectable for each image.
Dark frames subtraction and badpixels file support
Fast loading in editor.

rtengine/image16.h

@@ -29,6 +29,8 @@ namespace rtengine {
 
 enum TypeInterpolation { TI_Nearest, TI_Bilinear };
 
+class Image8;
+
 class Image16 : public ImageIO, public IImage16 {
 
     private:
@@ -54,6 +56,8 @@ class Image16 : public ImageIO, public IImage16 {
 
         Image16* copy ();
 
+		Image8* to8() const;
+
         Image16* rotate (int deg);
         Image16* hflip ();
         Image16* vflip ();