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Support .xz compression for Sources files and improve error handling

See merge request trisquel/trisquel-builder!10

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

Remove hardcoded python2

See merge request trisquel/trisquel-builder!9

Add -A flag for arch-all packages

See merge request trisquel/trisquel-builder!7

Revert 6786d54f

See merge request Ark74/trisquel-builder!1

This reverts commit 6786d54f

Fix to work as in README.md

See merge request !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