* boards/boardicons/connect4.png: Frank reworked the connect4 activity graphism.
	* boards/connect4/back.png:
	* boards/connect4/grid.png:
	* boards/connect4/tux-teacher.png:
	* boards/music/COPYRIGHT:
	* boards/music/intro.ogg: Ludovic Grossard reworked the intro music.
	It's based on the previous melody but sounds better.
	* src/boards/python/connect4.py: Fixed to work with new graphism
	* src/boards/smallnumbers.c: (smallnumbers_create_item): In case of 2 dices, one could be hidden
	on the right. It's fixed now.
	* src/gcompris/gcompris.c: Minor string change in the usage.