[pkg] Switch to Debian source format 3.0 (quilt) This forces us to base the Debian package on the source of the Python package (as produced by running `python3 setup.py sdist`). While it might seem cumbersome, this greatly reduces likelyhood of mismatch between an installation via `pip` and one using the Debian package. `dpkg-source` will also document for us what is currently in the source repository but not in the Python package. Currently the missing file are: PKG-INFO cubicweb/sobjects/test/data/cubicweb_comment/schema.py cubicweb/sobjects/test/data/cubicweb_comment/__init__.py cubicweb/sobjects/test/data/cubicweb_comment/__pkginfo__.py cubicweb/sobjects/test/data/cubicweb_card/schema.py cubicweb/sobjects/test/data/cubicweb_card/entities.py cubicweb/sobjects/test/data/cubicweb_card/__init__.py cubicweb/sobjects/test/data/cubicweb_card/__pkginfo__.py cubicweb/server/test/data-migractions/cubicweb_comment/schema.py cubicweb/server/test/data-migractions/cubicweb_comment/__init__.py cubicweb/server/test/data-migractions/cubicweb_comment/__pkginfo__.py cubicweb/server/test/data-migractions/cubicweb_localperms/schema.py cubicweb/server/test/data-migractions/cubicweb_localperms/__init__.py cubicweb/server/test/data-migractions/cubicweb_localperms/__pkginfo__.py cubicweb/server/test/data-migractions/cubicweb_basket/schema.py cubicweb/server/test/data-migractions/cubicweb_basket/__init__.py cubicweb/server/test/data-migractions/cubicweb_basket/__pkginfo__.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_comment/schema.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_comment/__init__.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_comment/__pkginfo__.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_localperms/schema.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_localperms/__init__.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_localperms/__pkginfo__.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_basket/schema.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_basket/__init__.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_basket/__pkginfo__.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_tag/schema.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_tag/__init__.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_tag/__pkginfo__.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_card/schema.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_card/__init__.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_card/__pkginfo__.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_file/schema.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_file/__init__.py cubicweb/server/test/data-migractions/migratedapp/cubicweb_file/__pkginfo__.py cubicweb/server/test/data-migractions/cubicweb_tag/schema.py cubicweb/server/test/data-migractions/cubicweb_tag/__init__.py cubicweb/server/test/data-migractions/cubicweb_tag/__pkginfo__.py cubicweb/server/test/data-migractions/cubicweb_card/schema.py cubicweb/server/test/data-migractions/cubicweb_card/__init__.py cubicweb/server/test/data-migractions/cubicweb_card/__pkginfo__.py cubicweb/server/test/data-migractions/cubicweb_file/schema.py cubicweb/server/test/data-migractions/cubicweb_file/__init__.py cubicweb/server/test/data-migractions/cubicweb_file/__pkginfo__.py cubicweb/test/data-rewrite/cubicweb_localperms/schema.py cubicweb/test/data-rewrite/cubicweb_localperms/__init__.py cubicweb/test/data-rewrite/cubicweb_localperms/__pkginfo__.py cubicweb/test/data-rewrite/cubicweb_card/schema.py cubicweb/test/data-rewrite/cubicweb_card/entities.py cubicweb/test/data-rewrite/cubicweb_card/__init__.py cubicweb/test/data-rewrite/cubicweb_card/__pkginfo__.py The current manifest will duplicate several files that are stored as symlinks in the Mercurial repository, hence the long list of ignored files in `extend-diff-ignore`.

^build$
^dist$
\.egg-info$
^.tox$
^.cache$
\.pyc$
\.pyo$
\.bak$
\.old$
\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
\.old$
\.pybuild
cubicweb/server/test/data/slapd.conf
debian/python-cubicweb
debian/*.log
debian/*.substvars
debian/cubicweb-doc
debian/cubicweb
debian/files

syntax: regexp
.*/data.*/database/.*
.*/data/ldapdb/.*
.*/data/uicache/
.*/data/libpython/cubicweb_.*/i18n/.*\.po
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/
^doc/_build
^doc/js_api/
test-results.xml
ve