fdawarp object from time_warping of aligned data using
the median.
alpha
quantile value (default=.05, i.e., 95%).
kp
scalar for outlier cutoff (default=1).
showplot
shows plots of functions (default = T).
References
Xie, W., S. Kurtek, K. Bharath, and Y. Sun (2016). "A geometric
approach to visualization of variability in functional data." Journal of
the American Statistical Association in press: 1-34.