feature 2965: replace custom mail functions by PHPMailer (version 5.2.7).

Based on patch by msakik.

function pwg_send_mail no longer used (all is done in pwg_mail)

new param $conf['smtp_secure']

work still in progress, some obsolete code must be removed


git-svn-id: http://piwigo.org/svn/trunk@24951 68402e56-0260-453c-a942-63ccdbb3a9ee

include/config_default.inc.php

@@ -262,6 +262,8 @@ $conf['smtp_host'] = '';
 $conf['smtp_user'] = '';
 $conf['smtp_password'] = '';
 
+// 'ssl' or 'tls'
+$conf['smtp_secure'] = null;
 
 // check_upgrade_feed: check if there are database upgrade required. Set to
 // true, a message will strongly encourage you to upgrade your database if