Julia language: DataFrames: insert a column

 The following code 

1. inserts a new column into DataFrame named df
2. inserts this column as a first (col_ind =1) column
3. names this column Rata_Die
4. populates the column values with an array of Int64 zeros (0)
5. makes sure the name of the column is unique

col_ind = 1

insertcols!(df, col_ind, :Rata_Die => zeros(Int64, record_count); makeunique = true )