criterion               Compute the empirical L_2 distance related to
                        the warping function.
estimationTheta         Estimate the warping parameters.
initialisationPara      Initialize the functional parameters
                        (associated to the aligned curves).
initialisationTheta     Initialize the warping parameters.
majPara                 Update the functional parameters (associated to
                        the aligned curves).
predictionTheta         Predict the warping parameters.
warpMix                 Estimate the non linear mixed effect functional
                        model.
warpTimeFunction        Compute the warped time points
