Radicale

* Workaround for contact photo bug in InfCloud
* Redirect GET and HEAD requests under `/.web` to sanitized path
* Set `Content-Length` header for HEAD requests
* Never send body for HEAD requests
* Improve error messages for `from_file` rights backend
* Don't sanitize WSGI script name

* Single `<D:propstat>` element in PROPPATCH response
* Allow multiple `<D:set>` and `<D:remove>` elements
* Improve log messages
* Fix date filter
* Improve sanitization of collection properties
* Cancel mkcalendar request on error
* Use **renameat2** on Linux for atomic overwriting of collections
* Command Line Parser
* Disallow abbreviated arguments
* Support backend specific options and HTTP headers
* Optional argument for boolean options
* Load no config file for `--config` without argument
* Allow float for server->timeout setting
* Fix **is-not-defined** filter in **addressbook-query** report
* Add python type hints
* Add **multifilesystem_nolock** storage
* Add support for Python 3.9 and 3.10
* Drop support for Python 3.5
* Fix compatibility with Evolution (Exceptions from recurrence rules)

* Allow web plugins to handle POST requests

* Start storage hook in own process group
* Kill storage hook on error or exit
* Try to kill child processes of storage hook
* Internal Server: Exit immediately when signal is received
(do not wait for clients or storage hook to finish)

* Fix internal server on FreeBSD

* Fix internal server on OpenBSD