Conflicts:
	modules/imgcodecs/include/opencv2/imgcodecs.hpp

set GA_Update flag in order remove ERROR 8: band 1: Attempt to write to read only dataset inGDALRasterBand::Fill()

QSlider does not have getMinimum/Maximum getters. Probably was not
compile tested.

fixed typo

The 12 and 16 arguments Matx constructors differs from all others,
leaving values initialized and requiring the argument number to be equal
to the channels number.

allows disabling automatic conversion to RGB for certain formats. If
conversion is disabled the returned image just points to the underlying
buffer, so no memcpy is performed.

Note that we do not check image size in retrieve frame any more as it
can not possibly while the device is streaming.
Furthermore this code was disabled altogether by the wrong ifdef in the
previous commit.

in the case of HAVE_CAMV4L2 && !HAVE_CAMV4L there was no body for the if
statement.