Clone a variable as part of a GADSdat object.
Arguments
- GADSdat
- GADSdatobject imported via- eatGADS.
- varName
- Name of the variable to be cloned. 
- new_varName
- Name of the new variable. 
- label_suffix
- Suffix added to variable label for the newly created variable in the - GADSdat.
- checkVarName
- Logical. Should - new_varNamebe checked by- checkVarNames?
