This subsets the data set on the variable name, picks out differences and returns a tibble of differences for the given variable
is_variable_different(variablename, keynames, datain, ...)
| variablename | name of variable being compared | 
|---|---|
| keynames | name of keys | 
| datain | Inputted dataset with base and compare vectors | 
| ... | Additional arguments which might be passed through (numerical accuracy) | 
A boolean vector which is T if target and current are different