Fix problem with Statist.Normalization and change signature.

Signed-off-by: SharplEr <sharplermc@gmail.com>
Add unit test for DateAnalysis.

Signed-off-by: SharplEr <sharplermc@gmail.com>
Real faster execution method vector.Copy than before.

Signed-off-by: SharplEr <sharplermc@gmail.com>