Friday November 16

Check over your version of the flocking model that we developed in class on
Monday, making sure it works the way you want it to.

Then, add file output to it, using the suggestions in Section 9.4. The file should
contain summary statistics about the flockmates of the birds. It should begin
with a header that describes the statistics, followed by lines of output, with
one line for each tick. Each line should contain the following data:
tick
minimum size of flockmates
number of birds with minimum size of flockmates
mean number of flockmates
maximum size of flockmates
number of birds with maximum size of flockmates