* GSoC 2016 - Adding toggle files to be used by tutorials.

Add a toggle option for tutorials.
* adds a button on the HTML tutorial pages to switch between blocks
* the default option is for languages: one can write a block
for C++ and another one for Python without re-writing the tutorial

Add aliases to the doxyfile.
* adding alises to make a link to previous and next tutorial.
* adding alias to specify the toggle options in the tutorials index.
* adding alias to add a youtube video directly from link.

Add a sample tutorial (mat_mask_opertaions) using the developed aliases:
* youtube alias
* previous and next tutorial alias
* buttons
* languages info for tutorial table of content
* code referances with snippets (and associated sample code files)

* Removing the automatic ordering.
Adding specific toggles for cpp, java and python.
Move all the code to the footer / header and Doxyfile.
Updating documentation.

This is based on testing OpenCV 3.1 with VisionWorks, which identified issues.
The tutorial now specifies 3 cherry-pick commands for opencv.

Update linux_install.markdown

Update linux_install.markdown

Update linux_install.markdown

Update linux_install.markdown

Update linux_install.markdown

Update linux_install.markdown

* Contribute a tutorial on building for NVIDIA Tegra

* Clean-up and fixes based on feedback.

resolves #6944

biicode docs added with fixes
fixed biicode docs

added biicode docs
added biicode docs

fixed #include typos

fixed whitespaces and tabs in indent

fixed whitespaces

small fixes

fixed trailing whitespace

trial fix #includes

fixed #includes

fixed link and branch name

For Bug #3714, user use the imshow() function without calling
namedWindow() properly, because user did not know the implicit rule for
imshow(). (i.e. without calling namedWindow implied calling namedWindow(
,CV__WINDOW_AUTOSIZE).

Improve the Display Image Tutorial to educate the user for such implied
rule.

Put a note on documentation for Bug#3714

Revise the documentation regarding to imshow() function to better
educate the user the implicit rule. (i.e. without creating the window
before the imshow() function is the same as creating AUTOSIZE window)