Added an agent with production value set by linear function on all
parameters in the production stimulus.  Idea inspired by Alkemade, F.,
and J. A. La Poutré. “Heterogeneous, Boundedly Rational Agents in the
Cournot Duopoly.” In Heterogenous Agents, Interactions and Economic
Performance, edited by Prof Robin Cowan and Dr Nicolas Jonard, 3–17.
Lecture Notes in Economics and Mathematical Systems 521. Springer Berlin
Heidelberg, 2003.
http://link.springer.com/chapter/10.1007/978-3-642-55651-7_1.