Removed the restriciton on copying rand object.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403397

dlib/rand/rand_kernel_1.h

@@ -103,11 +103,6 @@ namespace dlib
             mt19937 mt;
 
             std::string seed;
-
-            // restricted functions
-            rand_kernel_1(rand_kernel_1&);        // copy constructor
-            rand_kernel_1& operator=(rand_kernel_1&);    // assignment operator
-
     };
 
 

dlib/rand/rand_kernel_abstract.h

@@ -105,12 +105,6 @@ namespace dlib
                     - swaps *this and item
             !*/ 
 
-        private:
-
-            // restricted functions
-            rand(rand&);        // copy constructor
-            rand& operator=(rand&);    // assignment operator
-
     };
 
     inline void swap (