Explore - a Mandelbrot set explorer

This program displays an image of the famous Mandelbrot set. You can zoom
in the same way as in the Graph program, i.e.

- clicking the left mouse button zooms towards the point where you clicked.

- clicking the right mouse button zooms away from the point where you clicked.

- moving the mouse while the middle mouse button is pressed allows you to
  zoom in to an arbitrary rectangular area.

Although creating the image requires iterating a fuction 1-150 times per pixel,
it runs reasonably fast on a Pentium Pro 200MHz. When compiled with HBC,
Explore renders the initial image in about 4 seconds.

You can change the colors by using the flags

	-colorcount <n>		-- sets the number of colors
	-color1 <colorname>	-- sets one end of the color scale
	-color2 <colorname>	-- sets other end of the color scale

The function that describes the mandelbrot set is defined in module Mandelbrot.
By replacing it by another function, and perhaps changing the function
pickColor in Explore.hs, other images can be generated.

Author: Thomas Hallgren <hallgren@cs.chalmers.se>