SSE2 optimization for Bayer->RGB; added Bayer->Gray with SSE2 optimization; corrected some bugs noted in the yahoogroups forum

doc/core_array_operations.tex

@@ -5541,7 +5541,7 @@ Random number generator class.
 class CV_EXPORTS RNG
 {
 public:
-    enum { A=4164903690U, UNIFORM=0, NORMAL=1 };
+    enum { UNIFORM=0, NORMAL=1 };
 
     // constructors
     RNG();