Use new repoapi for the web stack
The publisher now link repoapi.ClientConnection to request. and explicitly
control there scope.
Web side, appobject._cw.cnx is now a repoapi.ClientConnection.
This actually kill webonly possibility until the repoapi is able to use some
RPC.
The change in the authentication stack is very hasty and need cleanup
debian/tmp/usr/lib/PY_VERSION/site-packages/cubicweb/web usr/lib/PY_VERSION/site-packages/cubicweb
debian/tmp/usr/share/cubicweb/cubes/shared/data usr/share/cubicweb/cubes/shared
debian/tmp/usr/share/cubicweb/cubes/shared/wdoc usr/share/cubicweb/cubes/shared