[fti] properly close the ProgressBar Ensures cubicweb-ctl db-rebuild-fti ends its output with a newline.

[serverctl] use repoapi for db-check, add-source, rebuild-fti commands One more step towards getting rid of dbapi.

[devtools] make get_repo_and_cnx return a repoapi ClientConnection And adjust callers accordingly (they need to use it as a context manager to open/close it properly).

[repoapi] Avoid deprecation warnings from session.id Apparently it's called session.sessionid now.

[server] some s/session/cnx/ For merely accessing the database we need a connection, not a session.

Move setting session.mtime from dbapi to web session manager clean_session was broken since the switch away from dbapi on the web side, since session.mtime wasn't being set anywhere.

[web] whitespace cleanup in http_headers.py

[web] implement cross origin resource sharing (CORS) (closes #2491768) Partial implementation that is enough to get started but leaves out some of the advanced features like caching and non-simple methods and headers.

[devtools] add a 'method' argument to RepoAccess.web_request so that one can easily forge a request with any HTTP method. Also a bunch of clone cleanups.

[web] Fix handling of some http headers The generator takes as argument a list of raw string values, and is supposed to return the parsed version. Calling str on that list makes no sense.