[debian] Update debian packaging (closes #16133259)
- use dh_python, pybuild and debhelper>=9,
- refactor and simplify the debian/rules,
- rename binary packages (but cubicweb-ctl) to python-xxx
- remove daemon handling stuff (initscripts...) from cubicweb-ctl (one should
now use a standard WSGI delivery method),
Document: cubicweb-doc
Title: CubicWeb Documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/python-cubicweb-documentation/html/index.html
Files: /usr/share/doc/python-cubicweb-documentation/html/*