* boards/read_colors/read_colors_background.png: Cleaned up by Karl Ove Hufthammer
	* boards/read_colors/read_colors_highlight.png: -
	* src/gcompris/file_selector.c: (display_files),
	(item_event_scroll): Yves found the bug. Now the scrollbar works as expected with the wheel
	* src/gcompris/images_selector.c: (gcompris_images_selector_start),
	(item_event_scroll): -