Configuration is now stored in JSON when using File configuration backend.
Old format is still working but the new format is applied at first configuration save.
Modern browsers do not take into account the autocomplete attribute in password fields anymore. This means even if you don't want users to remember the password, the browser will still propose it.
As it was not used anymore, this option is now removed. See https://jira.ow2.org/browse/LEMONLDAP-824 for more details.