Apriltag (#1570)

* doCornerRefinement to CornerRefinementMethod :: detected contours points are used to detect the corners

* some little corrections

* samples edited

* documented :)

* tabs corrected

* Docu corrections

* refinement for all candidates

* refinement for all candidates :: copy paste error corrected

* comment

* apriltag

* whitespace corrected

* corr ini

* correction :: warnings, c4244, preprocDirect, ...

* try to ignore 4244, fix 2131, add test, and ...

* try to ignore 4244

* test duplicate deleted

* corrected test, warnings

* test :: correction

* warnings

* warnings and test

* warnings

* perspective test, warning corrections

* warning a_q_t

* warning

* warning

* 3 clause BSD license

* stacksz and typo

* eliminate build warnings

- cv::fastAtan2()
- cvFloor()

* small code refactoring

* fix isfinite()

* get rid of manual calloc/free calls

* update file headers

* Enabled FastHoughTransform export to python.

* Enabled HoughPoint2Line export

* Update fast_hough_transform.hpp

deleted TODO

* Fixed indentation after enabling exporting.

* face: add a mace filter for authentication

As the type of `targetPatch` and `searchPatch` is CV_8UC3, subtracting 128 from them will saturate all values smaller than 128 to zero.

Implementation of CSR-DCF tracker (#1552)

* Initial commit for CSR-DCF tracker implementation

* Fixes for automatic build

* General code fixes

* Removed unused parameters. Added CSRT to automatic tests.

* Fixed VS build warnings. Fixed a bug with gray sequences.

* Fixed VS build errors for samples file.

so we can use the alpha channel for e.g. masking