Introducting soft-proofing and Black Point Compensation, simplify the

CMM at the end of the pipeline + sparse code refactoring
A new BPC checkbutton has been created in 'Preferences/Color Management'
and in the ICM tool. Better hanbling of widget sensitivity of the output
profile / gamma part of the ICM tool.

rtengine/image16.h

@@ -96,7 +96,7 @@ public:
         delete this;
     }
 
-    void                 ExecCMSTransform(cmsHTRANSFORM hTransform);
+    void                 ExecCMSTransform(cmsHTRANSFORM hTransform, const LabImage &labImage);
 };
 
 }