[pkg] Use Twisted < 16.0.0
We have some test failures with 16.0.0, such as:
- test_put_content (unittest_server.ETwistHTTPTC)
- test_base_url (unittest_httptest.TwistedCWAnonTC)
(grafted from 10c12f31d0fe38c2e8814176fc42bf2ea210efdf)
CubicWeb semantic web framework===============================CubicWeb is a entities / relations based knowledge management systemdevelopped at Logilab.This package contains:- a repository server- a RQL command line client to the repository- an adaptative modpython interface to the server- a bunch of other management toolsInstall-------More details at https://docs.cubicweb.org/book/admin/setupGetting started---------------Execute:: apt-get install cubicweb cubicweb-dev cubicweb-blog cubicweb-ctl create blog myblog cubicweb-ctl start -D myblog sensible-browser http://localhost:8080/Details at https://docs.cubicweb.org/tutorials/base/blog-in-five-minutesDocumentation-------------Look in the doc/ subdirectory or read https://docs.cubicweb.org/CubicWeb includes the Entypo pictograms by Daniel Bruce — www.entypo.com