Newton basins of attraction

            Draws the basins of attraction for the Newton iteration of known solutions to
the following equations :

z^3 - z = 0
z^3 = 1
z^4 = 1
z^5 = 1
z^6 = 1

cos(z) = 1/2
sin(z) = 1/2
tan(z) = 1 (buggy : divide by zero)

ch(z) = 2
sh(z) = 2
th(z) = 1/2 (buggy for the same reason)
	
Button "Agrandir" allows user to zoom on the Newton basins.

Button "Restaurer" draws back with the default size settings.