Added new N= argument in functions as_fc(), fc_filter() and fc_split() to enter the number of rows manually in case that a dataframe is not available.
New fc_export() function to export a flowchart in the desired format.
Solved bug when performing a split. Now the x-coordinates of the resulting boxes are placed symmetrically around the parent box, not homogeneously distributed across all the space.
Added round_digits= argument to fc_filter() and fc_split() functions, which allows to change the number of decimals to round percentages.
Added show_zero= argument to fc_split(), which allows to control whether the groups with zero events should be shown in a box or not.
Updated description with minimum R version (>= 4.1.0).