Bug#500830: Misc packaging fixes

[Loïc Minier <lool@dooz.org>]

 I prepared these additional changes as well:
  * Set DEB_MAKE_CHECK_TARGET to check || true to not fail the build if the
    testsuite doesn't pass; NB: it does seem to pass currently.
  * Use Vcs-* headers instead of XS-Vcs-*.
  * Bump up Standards-Version to 3.8.0.

 Test suite can be run and cause the build to fail if it fails by
 removing the || true which might be what one wants.

 I am attaching the watch file.

-- 
Loïc Minier

version=3
http://www.recherche.enac.fr/opti/facile/distrib/ \
        facile-([\d.]+).tar.gz