Add automated performance measurement system.

src/zcbenchmarks.h

@@ -0,0 +1,11 @@
+#ifndef BENCHMARKS_H
+#define BENCHMARKS_H
+
+#include <sys/time.h>
+#include <stdlib.h>
+
+extern double benchmark_sleep();
+extern double benchmark_parameter_loading();
+extern double benchmark_create_joinsplit();
+
+#endif