[skeleton] Fix modname in __pkginfo__

[test] Use plain unittest in unittest_cwctl.py

[devctl] Remove commented LiveServerCommand The code got commented in 2010 (changeset 5ab3f63b06ad)...

[pkg] Inline call to setup() in setup.py The point of having this "install" function, called in "main" mode is not clear. Better stick to standard practices.

[pkg] Drop old checks in setup.py

[tox] Exclude symlinks from check-manifest call These are not handled by check-manifest, see https://github.com/mgedmin/check-manifest/issues/69.

Drop the only reference to an '__insert' form key

Drop bits from the past (no more dbapi isolated installation)

[devtools] CWTC.request is gone, don't attempt to use it in CWTC.view So one will have to provide at least one of `rset` or `req` argument of the `view` method.

Merge 3.22 into 3.23 Some fixes there are necessary for client work depending on cubicweb 3.23.

[devtools] Handle i18ncube command for "cubes as packages" And add a test so that both layouts are tested. Move the test cube into a package. Related to #13001466.

Handle cubes as packages in cwconfig Rely on importlib.import_module in several places in cwconfig.py, so this would not work with python 2.6. Method available_cubes will not list cubes installed as package for now. I'm not sure it's worth implementing this method (used in `cubicweb-ctl list cubes` command) for new cubes layout as the same result can basically be obtained with `pip freeze | grep cubicweb_`. In unittest_cwconfig.py, duplicate CubicWebConfigurationTC test case to test both the "cubes as packages" layout and the "legacy cubes" layout. The former having a custom sys.path set (pointing to datapath('libpython') where all cubes' packages live) and the latter having the previous config attribute setup. All test data cubes are moved to packages in libpython directory and symlinks are introduced in the cubes directory. Related to #13001466.