Basic doxygen documentation support

- updated existing Doxyfile.in
- added corresponding cmake instructions
- added some specific files (layout, icon)
- clean existing doxygen warnings

Conflicts:
	CMakeLists.txt
	doc/CMakeLists.txt
	modules/core/include/opencv2/core.hpp
	modules/core/include/opencv2/core/base.hpp
	modules/core/include/opencv2/core/cuda.inl.hpp
	modules/core/include/opencv2/core/mat.hpp
	modules/core/include/opencv2/core/matx.hpp
	modules/core/include/opencv2/core/types.hpp
	modules/flann/include/opencv2/flann/lsh_table.h
	modules/imgproc/include/opencv2/imgproc.hpp

modules/contrib/include/opencv2/contrib/contrib.hpp

@@ -664,6 +664,7 @@ namespace cv
         *\param center the transformation center: where the output precision is maximal
         *\param R the number of rings of the cortical image (default value 70 pixel)
         *\param ro0 the radius of the blind spot (default value 3 pixel)
+        *\param interp interpolation algorithm
         *\param full \a 1 (default value) means that the retinal image (the inverse transform) is computed within the circumscribing circle.
         *            \a 0 means that the retinal image is computed within the inscribed circle.
         *\param S the number of sectors of the cortical image (default value 70 pixel).

modules/contrib/include/opencv2/contrib/retina.hpp

@@ -88,7 +88,7 @@ enum RETINA_COLORSAMPLINGMETHOD
 class RetinaFilter;
 
 /**
- * @class Retina a wrapper class which allows the Gipsa/Listic Labs model to be used.
+ * a wrapper class which allows the Gipsa/Listic Labs model to be used.
  * This retina model allows spatio-temporal image processing (applied on still images, video sequences).
  * As a summary, these are the retina model properties:
  * => It applies a spectral whithening (mid-frequency details enhancement)
@@ -199,7 +199,6 @@ public:
      * => if the xml file does not exist, then default setup is applied
      * => warning, Exceptions are thrown if read XML file is not valid
      * @param newParameters : a parameters structures updated with the new target configuration
-         * @param applyDefaultSetupOnFailure : set to true if an error must be thrown on error
      */
     void setup(RetinaParameters newParameters);
 
@@ -216,7 +215,7 @@ public:
 
     /**
      * write xml/yml formated parameters information
-     * @rparam fs : the filename of the xml file that will be open and writen with formatted parameters information
+     * @param fs : the filename of the xml file that will be open and writen with formatted parameters information
      */
     virtual void write( std::string fs ) const;