function?[X_whitened?Aw?u]?=?hyperWhiten（?X?）
%HYPERWHITEN?Whitens?a?data?matrix
%???hyperWhiten?whitens?a?data?matrix?by?performing?a?transform?upon?it?so
%?that?diagonals?of?its?covariance?matrix?are?all?unity.??Whitening?is
%?simply?a?coordinate?rotation?followed?by?a?scaling?factor.
%
%?Usage
%???[X_whitened]?=?hyperWhiten（?X?）
%?Inputs
%???X?-?2D??matrix?（p?x?N）
%?Outputs
%???X_whitened?-?2D?matrix?（p?x?N）?now?whitened
%???Aw?-?2D?whitening?matrix.
%???u?-?Vector?of?data?mean
%
%?References
%???http://en.wikip