version-update

date 2020-09-17

1. add rep_n() and rep_character() to rep each inner elements in vectors
   
2. add Apriori.Basket() to create basket format data for apriori analysis
   
3. add as.data.frame() to transform rules to dataframe for apriori analysis

date: 2020-07-27

1. add numeric.nms(), factor.nms(), character.nms(), and name.n() to get numeric names, factor names, character names and names with unique number values n.
   
2. add model.data() to extract data from model
3. add dump.it() to make dump variable names

date: 2020-06-30

1. simplify codes in Replace_ex() function.
   
2. add join_inner(), join_full(), join_left(), join_right(), join_out()