append_charnum_cols: Character and numeric columns
In jmbarbone/dirtyr: Deals with dirty data

Append data.frame with character and numeric columns

1	append_charnum_cols(x, cols, old = "_c", new = "_n", beside = TRUE)

`x`	A data.frame
`cols`	A vector of column names to be transformed from character to numeric.
`old, new`	A suffix added to the old/new columns; NULL will not change name; these cannot be the same
`beside`	Logical, if TRUE will add new columns beside old; otherwise will move to the end.