Stop checking for empty stat values from recursive_dirlist().

Remove the "if pst:" guard in index-cmd.py, since it doesn't appear to
be possible for recursive_dirlist() to return None for the stat value.

Signed-off-by: Rob Browning <rlb@defaultvalue.org>
Reviewed-by: Zoran Zaric <zz@zoranzaric.de>
Add preliminary hardlink support for review.

Thanks to Tim Riemenschneider <git@tim-riemenschneider.de> for
pointing out a compatibility problem (with older versions of Python)
in an earlier version of this patch.

Signed-off-by: Rob Browning <rlb@defaultvalue.org>
Reviewed-by: Zoran Zaric <zz@zoranzaric.de>