+ - Added new "login_before_page_header" (boolean) hook; allows
+ plugins to have more explicit control over login page header
+ - Added new "smtp_helo_override" hook; allows plugins to override
+ the HELO host sent to the SMTP server when sending messages
+ - Added PDO support for database connections, so no external
+ database module needs to be installed
+ - Fixed insufficient sendmail command argument escaping (thanks
+ to Mitchel Sahertian, Beyond Security/Dawid Golunski and Filippo
+ Cavallarin for bringing this to our attention). [CVE-2017-7692]
+ - Added ability to control the display of the "Check Spelling"
+ button provided by the squirrelspell plugin, which allows
+ administrators to offer this plugin but keep it out of the way
+ for users who do not want it. Put sqspell_show_button=0 in
+ default preferences if it should be hidden by default
+ - Add ability for saved drafts to indicate if they are a reply
+ or forward and if so, to which message, and mark that message
+ as replied or forwarded when the draft is finally sent
+ - Added option to allow returning to the message one had been
+ replying to after sending
+ - Sanitize user-supplied attachment filenames (thanks to Florian
+ Grunow for reporting this issue) [CVE-2018-8741]
+ - Changed anti-CSRF security token lifetime to be session-based.
+ - Added favicon and ability for admins to use their own by setting
+ $head_tag_extra in config_local.php (see documentation in
+ config/config_local.php)