Remove Twisted web server Twisted web server is not used anymore and has been superseded by pyramid many years ago. Furthermore, our usage is not compatible with Python 3. So we drop the "etwist" sub-package. As a consequence, "all-in-one" configuration type gets dropped as it was Twisted-specific. We resurrect it in cubicweb/pyramid/config.py by only keeping options used by the "pyramid". Similarly, we introduce a AllInOneCreateHandler in cubicweb/pyramid/pyramidctl.py that is basically the one that lived in cubicweb/etwist/twctl.py and is used to create the "all-in-one" instance. Added a TODO here about "pyramid.ini" that could be generated at the end of bootstrap() method. In cubicweb/devtools/httptest.py, CubicWebServerTC is now equivalent to CubicWebWsgiTC and the latter is dropped.

from os import unlink
from os.path import isfile, join
from cubicweb.cwconfig import CubicWebConfiguration as cwcfg

regdir = cwcfg.instances_dir()

if isfile(join(regdir, 'startorder')):
    if confirm('The startorder file is not used anymore in Cubicweb 3.22. '
               'Should I delete it?',
               shell=False, pdb=False):
        unlink(join(regdir, 'startorder'))