Add atlas hardware RAID recovery

doc/atlas.md

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+# atlas
+## Recover data from hardware RAID
+```shell
+losetup -r -o 524288 /dev/loop0 /dev/sde
+losetup -r -o 524288 /dev/loop1 /dev/sdf
+losetup -r -o 524288 /dev/loop2 /dev/sdg
+losetup -r -o 524288 /dev/loop3 /dev/sdh
+fdisk -l /dev/loop{0,1,2,3}
+
+losetup -d /dev/loop2
+losetup -r -o 10301734912 /dev/loop2 /dev/sdg
+mkdir /mnt/atlas_root
+mount -o ro /dev/loop2 /mnt/atlas_root/
+
+losetup -d /dev/loop{0,1,3}
+losetup -o 524288 /dev/loop0 /dev/sde
+losetup -o 524288 /dev/loop1 /dev/sdf
+losetup -o 524288 /dev/loop3 /dev/sdh
+apt-get install lvm2
+service lvm2 start
+vgscan
+vgchange -ay
+mkdir /mnt/atlas_daten
+mkdir /mnt/atlas_home
+mount -o ro -t ext4 /dev/mapper/vg_daten-daten /mnt/atlas_daten/
+mount -o ro -t ext4 /dev/mapper/vg_home-home /mnt/atlas_home/
+
+umount /mnt/atlas_*
+
+losetup -d /dev/loop{0,1,2,3}
+```
+## Power off and remove disks, reload smartd
+```shell
+hdparm -Y /dev/sd{e,f,h}
+hdparm -C /dev/sd{e,f,h}
+service smartd restart
+```