Clone a variable as part of a GADSdat object.
Arguments
- GADSdat
 GADSdatobject imported viaeatGADS.- 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 bycheckVarNames?
