wsfixed

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

- IPP is disabled by default when compiler is mingw (couldn't make it
work)
- fixed some warnings
- fixed some `__GNUC__` version checks (for correctness and convenience)
- removed UTF-8 BOM from hough.cpp (fixes #5253)

by this new function we can set libjpeg "scale_denom" parameter and load jpeg images scaled 1/2 - 1/4 - 1/8
other image formats resized after loading

Conflicts:
	modules/highgui/src/grfmt_tiff.cpp

floodfill return value removed

Some TIFF images consist of only one strip. The magic value 2**32-1 for the
"rows per strip" tag reflects that fact, effectively meaning "infinite".

Conflicts:
	modules/highgui/src/grfmt_tiff.cpp
	modules/highgui/test/test_grfmt.cpp

fix whitespace

fix compile error

Jpeg2k color to greyscale conversion on non-Windows is done post decoding because system libjasper segfaults when decoding color images as greyscale.

added support for uncompressed parameters to tiff image format as described here: expertland.net/question/b6o3n6p9a72341db823b48nl98m91dx8n1/detail.html

- previous pull request: https://github.com/Itseez/opencv/pull/3340