Comment 2 for bug 1044715

This is a patch supported the feature.

$duplicity collection-status --file-changed c1 --archive-dir=./b/sigs file://./b
Local and Remote metadata are synchronized, no sync needed.
Last full backup date: Thu May 7 17:25:01 2015
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File path: c1
Total number of backup: 4
 Type of backup set: Time:
                Full Thu May 7 17:25:01 2015
         Incremental Thu May 7 17:25:16 2015
         Incremental Thu May 7 17:25:24 2015
         Incremental Thu May 7 17:25:27 2015
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