data_part(), data_part_list(), data_Kfold(), data_boot_index() and data_boot_weights() are added.data_leverage() added.Functions data_str() and data_exclude_class() are modified to work with POSIXct class.
Functions data_dim() and data_omit() are separated.
Function data_cut() added. This function insures that for very large data sets the plotting function like data_plot() and data_xyplot() only use a random part of the data so they are are working fast.
Functions void() and data_void() added.
Function data_part_list() added.
Function data_rename() added.
Partial correlation functiom data_pcor() added.
Replacement of the use of class()== with inherits().
Bug fix in the function data_re1val() when the variable was a factor.