* Add Grana's connected components algorithm for 8-way connectivity. That algorithm is faster than Wu's one (currently implemented in opencv). For more details see https://github.com/prittt/YACCLAB.

* New functions signature and distance transform compatibility

* Add tests to imgproc/test/test_connectedcomponents.cpp

* Change of test_connectedcomponents.cpp for c++98 support

strong and retain are synonymous but using strong along with  obsolete synonym retain in one file is negligent

Enable SSE optimization

  * DRY
  * switch to Cv32suf and remove fp32Int32
  * add Cv16suf

- one test for type_id;
- another for comments in JSON;

Fixes spelling in comment

resolve undeclared identifier close error

The Mat "src_copy" is never used.

Fix for incorrect calcOpticalFlowPyrLK result evaluation with ARM NEON