- don't override current application thread names
- set name for own threads only

Test create custom layer in python

* check is contiguos

* Add custom layer test

* Fix test

* Remove assert

* Move assert to pyopencv dnn

* remove assert

* Add unregister

* Fix python2

* proto to bytearray

* Fix data type

* calib3d: use normalized input in solvePnPGeneric()

* calib3d: java regression test for solvePnPGeneric

* calib3d: python regression test for solvePnPGeneric

* core: disable invalid constructors in C API by default

- C API objects will lose their default initializers through constructors

* samples: stop using of C API

- #if 0
- #ifdef __OPENCV_BUILD

- required to unregister callbacks from system

* Support nGraph

* Fix resize

  - add reference to Rodrigues Jacobian
  - add references to SE(3) and Lie Groups topics
  - update some conventions and pinhole figure

(1/4) Revert "Correct image borders and principal point computation in cv::stereoRectify"

This reverts commit 93ff1fb2.

(2/4) Revert "fix calib3d changes in 6836 plus some others"

This reverts commit fa42a1cf.

(3/4) Revert "fix compiler warning"

This reverts commit b3d55489.

(4/4) Revert "add test for 6836"

This reverts commit d06b8c4e.

Tests for argument conversion of Python bindings generator

* Tests for parsing elemental types from Python bindings

  - Add positive and negative tests for int, float, double, size_t,
    const char*, bool.
  - Tests with wrong conversion behavior are skipped.

* Move implicit conversion of bool to integer/floating types to wrong
conversion behavior.

- apply tag 'skip_other'