Added dark frame subtraction

Moved debayer and preprocessing parameters to class ProcParams for every single image.
Added tab RAW for changing those parameters.
Progress bar shows only load step (work to do)

rtengine/labimage.cc

@@ -0,0 +1,42 @@
+#include <labimage.h>
+namespace rtengine {
+
+LabImage::LabImage (int w, int h) : W(w), H(h), fromImage(false) {
+
+    L = new unsigned short*[H];
+    for (int i=0; i<H; i++)
+        L[i] = new unsigned short[W];
+
+    a = new short*[H];
+    for (int i=0; i<H; i++)
+        a[i] = new short[W];
+
+    b = new short*[H];
+    for (int i=0; i<H; i++)
+        b[i] = new short[W];
+}
+
+LabImage::LabImage (Image16* im) {
+
+    W = im->width;
+    H = im->height;
+    L = im->r;
+    a = (short**) im->g;
+    b = (short**) im->b;
+    fromImage = true;
+}
+
+LabImage::~LabImage () {
+
+    if (!fromImage) {
+        for (int i=0; i<H; i++) {
+            delete [] L[i];
+            delete [] a[i];
+            delete [] b[i];
+        }
+        delete [] L;
+        delete [] a;
+        delete [] b;
+    }
+}
+}