regression test for bug 3172
fix for bug 3172
increase epsilon for TVL1 sanity test
increase epsilon for ResizeSameAsHost test
use downscaled frames in FGDStatModel test
fix BGR->BGR5x5 color convertion
Fixed getConversionInfo() for YUV2RGBA_* conversions
fixing GT and GE comparison symbol
Merge pull request #3118 from akarsakov:fix_cvtcolor_perf
Merge pull request #3120 from StevenPuttemans:fix_bug3863
Fixed range for 'v' channel for 8U images.
Merge pull request #3137 from akarsakov:fix_cvtcolor_luv_rgb
fix CUDA cvtColor after corresponding change in CPU version

see https://github.com/Itseez/opencv/pull/3137
Several fixes for lintian varnings
Merge pull request #3143 from jet47:cuda-cvt-color-fix
Merge pull request #3109 from jet47:gpu-test-fixes
Merge pull request #3147 from asmorkalov:ocv_deb_lintian_fixes
Can create training set in PNG format

The format of the training set can be changed with the `-pngoutput` key.
Output image will be resized to a 640x480 size if greater.
Typo in string fixed
Class naming update
Documentation improvement
Bug in output format for JPG set fixed