Introduce pheromones

pheromone.h

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+#ifndef BRMLIFE__PHEROMONE_H
+#define BRMLIFE__PHEROMONE_H
+
+/* Pheromone spectrum in a particular state. */
+
+#include <list>
+
+#define PH_COUNT 65536
+
+class pheromone {
+public:
+	int id;
+	double val;
+
+	pheromone(int id_ = 0, double val_ = 0)
+	: id (id_), val (val_) {};
+};
+
+class pheromones {
+public:
+	std::list<class pheromone> spectrum;
+
+	/* Add a pheromone to the spectrum. */
+	void secrete(class pheromone &p);
+	/* Merge slight trail of spectrum to another spectrum (transfer
+	 * by touching). Pheromones with lower index are transmitted
+	 * better than those with higher index:
+	 * v' = v * (alpha / i + beta) */
+	void seep(class pheromones &to, double alpha, double beta);
+	/* Decay the spectrum, multiplying each value by gamma and
+	 * then reducing it by delta. */
+	void decay(double gamma, double delta);
+};
+
+#endif