darcs patch: Fix defect when unpacking tar files containing links

Tue Mar 4 20:42:55 CET 2008 Lennart Kolmodin * Fix defect when unpacking tar files containing links There were two issues; * Unpacking links that point to files not yet unpacked * Used the link target as absolute path, but it's relative This patch addresses both issues, which is ticket #246. There may still be errors if a link refer to another link which has not been unpacked yet.