[web/test] Drop folder cube dependency
Copy useful schema bits, define IBreadCrumbs adapter for Folder/fild_under
(previously relying on ITree adapter) and adjust unittest_viewselector tests
to drop a view that does not exist anymore.
Related to #5168939.
\.svn
^build$
^dist$
\.pyc$
\.pyo$
\.bak$
\.old$
\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
\.old$
syntax: regexp
.*/data/database/.*\.sqlite
.*/data/database/.*\.config
.*/data/database/tmpdb.*
.*/data/ldapdb/.*
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/
data/pgdb/