[Precise] btrfs-tools much too old for kernel features

The btrfs-tools package that comes with precise is 0.19+20100601-3ubuntu3, (2010 !) which, given the pace of BTRFS development, is much older than the current BTRFS version that the kernel supports.

This results in several issues among which :

- Unable to convert back to ext4 a filesystem that has been converted from ext4 to BTRFS then mounted (btrfs-convert -r will state the volume has unsupported features, and then segfault)

- btrfsck is unusable : will state the volume has unsupported features, and then segfault.

Please update the btrfs-tools package to a decently recent version, corresponding to the BRFS features that the kernel actually implements.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: btrfs-tools 0.19+20100601-3ubuntu3
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
Uname: Linux 3.2.0-26-generic x86_64
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
Date: Mon Jul 2 10:04:36 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: btrfs-tools
UpgradeStatus: No upgrade log present (probably fresh install)