Interface to normalization methods.

Executes area normalization : y' = (y-min)/(mean), in which min and mean are the minimal and the mean values of the array.

Executes min-max normalization : y' = (y-min)/(max-min), in which min and max are the minimal and maximal values of the array.

Executes SVN (standard normal variate) normalization : y' = (y-mean)/(std), in which meam and std are the mean value and the standard deviation of the array values.

Executes vector normalization : y' = (y)/(norm), in which norm is the L2 norm of the array.