This is support for the functions fk().
It is not intended to be called directly by users. T
he function gamlss.fk is calling on the R function curfit.free.knot() of Sundar Dorai-Raj
Dierckx, P. (1991) Curve and Surface Fitting with Splines, Oxford Science Publications
Stasinopoulos D. M., Rigby R.A. and Akantziliotou C. (2006) Instructions on how to use the GAMLSS package in R.
Accompanying documentation in the current GAMLSS help files, (see also http://www.gamlss.org/).
Stasinopoulos D. M. Rigby R.A. (2007) Generalized additive models for location scale and shape (GAMLSS) in R.
Journal of Statistical Software, Vol. 23, Issue 7, Dec 2007, http://www.jstatsoft.org/v23/i07.