fstarlab.icn: Program to draw fractal stars

This program draws fractal "stars".  For a discussion of fractal
stars, see

     Fractals; Endlessly Repeated Geometrical Figures, Hans Lauwerier,
     Princeton University Press, 1991, pp. 72-77.

and

     Geometric and Artistic Graphics; Design Generation with
     Microcomputers, Jean-Paul Delahaye, Macmillan, 1987, pp. 55-63.

The window is square.  The window size can be given on the command line,
default 600.

The present user interface is crude.  To see all the fractal stars
that are provided by default, type

     all

from standard input.  After each star is drawn, the program waits
for an event before going on to the next star.

Alternatively, a single star can be drawn by typing its name preceded
by an equals sign.  The names are fstar01 through fstar13.  For example,

     =fstar09

draws the ninth star.

In future extensions, provision will be made for user-defined stars.