[skeleton] Update Debian packaging template
Here are multiple updates to the Debian packaging template provided when
running `cubicweb-ctl newcube`:
* Switch to source format 3.0 (quilt).
* Switch to debhelper 9.
* Switch to dh-python.
* Switch to Python 3.
* Name the binary package `python3-cubicweb-CUBENAME` instead of
just `cubicweb-CUBENAME` (which is still the source package).
* Populate Depends using dh_python3 support for Python requirements.
* Run test suite at build time using pytest.
* Add autopkgtest to run test suite against the installed package.
* Bump Standards-Version to 4.3.0.
extend-diff-ignore = "^(__pkginfo__\.py$|doc/_themes/cubicweb/static/(logo-cubicweb-small\.svg|cubicweb\.ico|logo-cubicweb\.svg)$|cubicweb/(sobjects/test/data/(cubicweb_comment|cubicweb_card)|server/test/data-migractions/(migratedapp/)?(cubicweb_comment|cubicweb_localperms|cubicweb_basket|cubicweb_tag|cubicweb_card|cubicweb_file)|test/data-rewrite/(cubicweb_localperms|cubicweb_card))$|cubicweb\.spec$|setup\.cfg$|cubicweb/misc/cwfs)"