added small piece of code to remove duplicates from integer array.
Starting work on the display program in Gtk3/
Working version of the graphics function.
revised the parameters for the draw_penta function
Added file_penta function. Write individual pentagons to a .png file. Can be printed by :lp Penta_nn_n_i.png or animated by animate -delay 100 *.png
Added a scale factor to the images.
Copyright notice updated
Editorial changes