youtube-dl: "link" to python directly
bup: upgrade to git20121224
btrfs-progs: small patch to fix listing subvolumes on kernel 3.6+

The btrfs cleaner, introduced in 3.6 leaves some unresolvable entries,
which the userspace utils don't know how to handle.
btrfs-progs: minor patches to get "btrfs receive" working
btrfs-progs: add small tool to set the received-uuid of exisiting subvolumes