Analyse and fix last errors

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Migrated from T174 (view on Phabricator)

assigned to @ardumont

marked this issue as related to #90 (closed)

added Directory loader Tarball loader priority:Normal labels

added priority:High label and removed priority:Normal label

• Do not skip tarball containing empty upper root directory

• Fix broken link size and data computation

• Corrupt archive: compressed file ended before the end-of-stream marker

closed