Changes from version 2.2.2 to 2.2.3
 * Citation to the Journal of Statistical Software paper included
Changes from version 2.2.1 to 2.2.2
 * Arma identification deactivated in some weird cases
 * minor bugs fixed
Changes from version 2.2 to 2.2.1
 * Help documentation improved
 * Bugs fixed
Changes from version 2.1.2 to 2.2
 * New function getp0 to get initial conditions of parameters
 * Output table of UCvalidate changed to show parameters and their asymptotic s.e. in the original parameter space
 * Many bugs fixed. Among them the most important are NaNs in covariance of parameters
 * New fields added to UComp objects: covariance matrix of estimates (covp); number of iterations in estimation (iter)
 * Zero components not return to make plot(model) prittier.
 * Labels added to estimated states.
 * Documentation improved.
 * Sales time series removed.
 * Predict function extended to prediction intervals





