* fix #1665 ChAruco board topology (nearestMarkerIdx) is sensitive to scale

* Some bugs in deriche and paillou filter

* Cv_Assert to CV_CheckType

enables an ordered chain of full-screen post processing effects

Bug fixes: using mask with BinaryDescriptor  (#1652)

* Bug fixes: erasing an element from std::vector should not move iterator forward

* Bug fixes: add a NULL checking

* Remove the appoggio matrix generation, which is useless

Added if condition, whether faces are detected or not, will help to keep program running for some images.
If imwrite used along with imshow, it may produce error for :  No faces found.Aborting.. in function 'fit' (Bad Argument).

Add AprilTag dictionaries to be able to detect AprilTag markers. Add ArUco and AprilTag 2 citations.

* android: fix build warnings

* build: fix warnings