README.TXT: Datasource setup: Testing: Added step to test column-based import (by_col=1), because it is stricter about types than row-based import and sometimes fails when row-based import succeeds
README.TXT: Datasource setup: Testing: Added step to test column-based import (by_col=1), because it is stricter about types than row-based import and sometimes fails when row-based import succeeds