[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.

[MASTER]
load-plugins=cubicweb.pylintext
ignore=__pkginfo__

[MESSAGES CONTROL]
disable = too-many-ancestors,too-many-instance-attributes,too-many-public-methods,
      too-few-public-methods,too-many-arguments,import-error

[BASIC]
function-rgx = [a-z_][a-z0-9_]{2,35}$
good-names=w,_

[TYPECHECK]
generated-members=debug,info,notice,warning,error,critical,exception

[CLASSES]
exclude-protected=_cw,_cnx,
      # namedtuple public API.
      _asdict,_fields,_replace,_source,_make


[FORMAT]
max-line-length=100
max-module-lines=2000