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Support .xz compression for Sources files and improve error handling

See merge request !10

This is needed because debian stable archives do no longer
have Sources.gz but Sources.xz instead

Remove hardcoded python2

See merge request !9

Add -A flag for arch-all packages

See merge request trisquel/trisquel-builder!7

Revert 6786d54f

See merge request !1

This reverts commit 6786d54f

Fix to work as in README.md

See merge request trisquel/trisquel-builder!6

For reference, those are the avaliable hooks:

A 	Is for --build target. It is executed before build starts; after unpacking the build system, and unpacking the source, and satisfying the build-dependency.
B 	s executed after build system finishes building, successfully, before copying back the build result.
C 	Is executed after build failure, before cleanup.
D 	Is executed before unpacking the source inside the chroot, after setting up the chroot environment. Create $TMP, and $TMPDIR if necessary. This is called before build-dependency is satisfied. Also useful for calling apt-get update
E 	Is executed after pbuilder --update and pbuilder --create finishes apt-get work with the chroot, before umounting kernel file systems (/proc) and creating the tarball from the chroot.
F 	Is executed just before user logs in, or program starts executing, after chroot is created in --login or --execute target.
G 	Is executed just after debootstrap finishes, and configuration is loaded, and pbuilder starts mounting /proc and invoking apt-get install in --create target.

(From http://wiki.tanglu.org/Setup_pBuilder_Develop_Environment )

Avoids the warnings about FcntlLock not avaliable

Fix toxcore

Toxcore fails to run signed-dsc without dh-systemd http://jenkins.trisquel.info:8085/job/signed-dsc/780/

See merge request !1

dh-translations and gnome-pkg-tools are needed by nautilus
python3-distutils-extra needed by usb-creator

Needed by make-linux* helpers