The "kccaFamily" class was modified to also include a
slot "genDist" which can be used to define a family where
its functions, e.g., the distance, depend on the data. This
contribution was provided by Lena Ortega Menjivar and
Dominik Ernst.
The input data for kcca() can now be an object which
can be coerced to a numeric matrix using
data.matrix().
Inserted DOI and removed URL for Leisch (1999).
Packages moved from Depends to Imports.