v0.18.3

• bugfix: do not perturb cells with value 0 using flex-approach
• bugfix: use only actual number of contributors in flex-approach when perturbing numvars
• performance-improvment: speed-up computation of contributing units to cells
• bugfix: scrambling cell keys having not enough digits
• bugfix: computation separation point in flex-approach
• set default value of argument w = NULL in ck_setup()
• improve some error messages/outputs
• bugfix when looking up perturbation values; small_cells and others must not intersect
• fixing issues with empty cells for magnitude tables
• fixed computation of weighted spreads, thx @staudtlex
• do not perturb cells with 0 contributors in the flex-approach
• update tests due to updates in digest-pkg
• correctly compute weighted spread
• do not convert variable names to lowercase
• document R6 methods/classes via roxygen2
• new method hierarchy_info() containing some important information for each dimension
• reference new methods create_cnt_ptable() and create_num_ptable() from ptable-pkg
• update vignette
• improve documentation of ck_params_nums()
• update tests due to updates in ptable-pkg