added support for XML reading/writing

new serialization interfaces
new helper methods
new wifi models

math/MovingStdDevTS.h

@@ -0,0 +1,49 @@
+#ifndef MOVINGSTDDEVTS_H
+#define MOVINGSTDDEVTS_H
+
+#include "MovingAverageTS.h"
+
+/**
+ * moving stadnard-deviation using a given time-region
+ */
+template <typename T> class MovingStdDevTS {
+
+private:
+
+	MovingAverageTS<T> avg;
+	MovingAverageTS<T> avg2;
+
+
+public:
+
+
+	/** ctor with the window-size to use */
+	MovingStdDevTS(const Timestamp window, const T zeroElement) : avg(window, zeroElement), avg2(window, zeroElement) {
+		;
+	}
+
+	/** add a new entry */
+	void add(const Timestamp ts, const T& data) {
+
+		// E(x)
+		avg.add(ts, data);
+
+		// E(x^2)
+		avg2.add(ts, data*data);
+
+	}
+
+	/** get the current std-dev */
+	T get() const {
+
+		const T e = avg.get();
+		const T e2 = avg2.get();
+		const T var = e2 - e*e;
+		return std::sqrt(var);
+
+	}
+
+
+};
+
+#endif // MOVINGSTDDEVTS_H