Update debian packaging with support for python3

Switch to 3.0 quilt source format.
Introduce a python-cubicweb-person package replacing cubicweb-person.
Add a python3-cubicweb-person package.

debian/control

@@ -3,26 +3,48 @@ Section: web
 Priority: optional
 Maintainer: Logilab Packaging Team <contact@logilab.fr>
 Uploaders: Sylvain Thenault <sylvain.thenault@logilab.fr>
-Build-Depends:
- debhelper (>= 9),
- python (>= 2.7), 
- dh-python,
- python-setuptools,
-Standards-Version: 3.9.8
-Homepage: https://www.cubicweb.org/project/cubicweb-person
+Build-Depends: debhelper (>= 9),
+               dh-python,
+               python-all,
+               python-setuptools,
+               python-pytest,
+               python-cubicweb,
+               python3-all,
+               python3-setuptools,
+               python3-pytest,
+               python3-cubicweb,
+Standards-Version: 4.3.0
 X-Python-Version: >= 2.7
+X-Python3-Version: >= 3.5
+Homepage: https://www.cubicweb.org/project/cubicweb-person
 
-Package: cubicweb-person
+Package: python-cubicweb-person
+Architecture: all
+Depends: ${misc:Depends}, ${python:Depends}
+Recommends:
+ python-cubicweb-addressbook
+Breaks: cubicweb-person (<< 1.11.0-1~)
+Replaces: cubicweb-person (<< 1.11.0-1~)
+Description: person component for the CubicWeb framework
+ This CubicWeb component models person (firstname, lastname,
+ email address and optional postal address).
+ .
+ CubicWeb is a semantic web application framework, see http://www.cubicweb.org
+
+Package: python3-cubicweb-person
 Architecture: all
-Depends:
- python-cubicweb (>= 3.24),
- python-six (>= 1.4.0),
- ${python:Depends},
- ${misc:Depends},
+Depends: ${misc:Depends}, ${python3:Depends}
 Recommends:
- cubicweb-addressbook
+ python3-cubicweb-addressbook
 Description: person component for the CubicWeb framework
  This CubicWeb component models person (firstname, lastname,
  email address and optional postal address).
  .
  CubicWeb is a semantic web application framework, see http://www.cubicweb.org
+
+Package: cubicweb-person
+Architecture: all
+Section: oldlibs
+Depends: python-cubicweb-person, ${misc:Depends}
+Description: transitional package
+ This is a transitional package. It can safely be removed.

debian/rules

 #!/usr/bin/make -f
 
+export PYBUILD_NAME = cubicweb-person
+
 %:
-	dh $@ --with python2
+	dh $@ --with python2,python3 --buildsystem=pybuild

debian/source/format

+3.0 (quilt)

debian/source/options

+extend-diff-ignore = "^(.hg(/|ignore$|tags$))"