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Migrate from aufs to overlayfs

Tails uses aufs, that is 1. is a pain to use with the grsecurity patchset; 2. is out-of-tree and requires aufs-dkms. overlayfs has none of these problems. It’s been merged into Linux 3.18 and the Debian kernel team would like to drop support for aufs at some point.

team: segfault, intrigeri

Feature Branch: wip/feature/8415-overlayfs-stretch

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Original created by @intrigeri on 8415 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information