Add Java and Python code for the following imgproc tutorials: Finding contours in your image, Convex Hull, Creating Bounding boxes and circles for contours, Creating Bounding rotated boxes and ellipses for contours, Image Moments, Point Polygon Test.

Add LD_PRELOAD instruction to be able to run Java code that calls OpenCV functions that use the Intel MKL library.

Improved readability by correcting grammar and idioms.

Further improved language and readability.

Attempted to fix list bullets.

Again, attempted to fix list bullets.

Removed trailing whitespace on line 8.

Other links:
- https://raw.githubusercontent.com/opencv/opencv/master
- https://github.com/opencv/opencv/blob/master

Add Java and Python code for the following features2d tutorials: Harris corner detector, Shi-Tomasi corner detector, Creating your own corner detector, Detecting corners location in subpixels, Feature Detection, Feature Description, Feature Matching with FLANN, Features2D + Homography to find a known object. Use Lowe's ratio test to filter the matches.

Add Java and Python code for the following imgproc tutorials: Affine Transformations, Histogram Equalization, Histogram Calculation, Histogram Comparison, Back Projection.

Add Java and Python code for the following imgproc tutorials: Canny, Remap, threshold and threshold inRange. Use HSV colorspace instead of RGB for inRange threshold tutorial.

Fix publication date of "Computer Vision Face Tracking for Use in a Perceptual User Interface" from 1988 to 1998.

* Custom deep learning layers support

* Stack custom deep learning layers

  * remove NVidia and Nvidia
  * replace Cuda with CUDA
  * keep the letters for API

Correct a mistake in {js,py}_table_of_contents_histograms.markdown (#11260)

* Update py_table_of_contents_histograms.markdown

"Learn to find and draw Contours" => "Learn the basics of histograms"

* Update js_table_of_contents_histograms.markdown

Corrected a seemlingly wronged line of copy in the python documention js_table_of_contents_histograms.markdown

"Learn to find and draw Contours" => "Learn the basics of histograms"

project is not active anymore

Apparently the blog has been updated and the URL has changed, it is still there though.

OpenCV 3.4.1

Found via `codespell`

Found via `codespell -q 3 --skip="./3rdparty" -I ../opencv-whitelist.txt`

Documentation generation refactoring (#10621)

* Documentation build updates:

- disable documentation by default, do not add to ALL target
- combine Doxygen and Javadoc
- optimize Doxygen html

* javadoc: fix path in build directory

* cmake: fix "Documentation" status line