also search "previous" output dir

[aekiss]

Runs 000-413 of 01deg_jra55v13_ryf8485_spinup6 have been moved to /g/data/hh5/tmp/cosima/access-om2-01/01deg_jra55v13_ryf8485_spinup6_000-413 and there's a symlink /g/data/hh5/tmp/cosima/access-om2-01/01deg_jra55v13_ryf8485_spinup6/previous that points to it.
This should be added to list of dirs searched when looking for run data.