* 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

Fix for incorrect calcOpticalFlowPyrLK result evaluation with ARM NEON

UIImages with alpha were ending up with garbage pixels in background (random memory values).  Need to initialize matrix pixels before drawing UIImage with alpha on it.

Note: didn’t fix Grayscale image with alpha stripping alpha in UIImage -> Mat conversion.