Add next and previous navigation links to all tutorials

doc/tutorials/gpu/gpu-basics-similarity/gpu_basics_similarity.markdown

@@ -2,6 +2,8 @@ Similarity check (PNSR and SSIM) on the GPU {#tutorial_gpu_basics_similarity}
 ===========================================
 @todo update this tutorial
 
+@next_tutorial{tutorial_gpu_thrust_interop}
+
 Goal
 ----
 

doc/tutorials/gpu/gpu-thrust-interop/gpu_thrust_interop.markdown

@@ -1,6 +1,8 @@
 Using a cv::cuda::GpuMat with thrust {#tutorial_gpu_thrust_interop}
 ===========================================
 
+@prev_tutorial{tutorial_gpu_basics_similarity}
+
 Goal
 ----