This reverts commit 7d91b8ef.

This test does not return correct values with some software configurations.
Possible problem with ffmpeg on buildbot's linux-slave.

Fix problems on NVidia devices.

- Imgcodecs_Image, write_imageseq - assuming JPEG images have losses
- Imgcodecs_Drawing, c_regression - replaced assert calls
- Imgcodecs_Drawing - exact comparison with reference image

- updated existing Doxyfile.in
- added corresponding cmake instructions
- added some specific files (layout, icon)
- clean existing doxygen warnings