A NetLogo replication of the model presented in the following papers:
Smaldino PE, Schank JC, McElreath R (2013) Increased costs of cooperation help cooperators in the long run.
The American Naturalist 181: 451–463.
Smaldino PE (2013) Cooperation in harsh environments and the emergence of spatial patterns. Chaos, Solitons
& Fractals 56: 6–12.