Update to newer phpmailer and add multipe to addresses

Added a newer version of the phpmailer library to support secure (ssl, tls) SMTP.  This adds a new setting in config.php-dist SMTP_SECURE which can be empty, or be tls or ssl, depending on the kind of secure conneciton your SMTP uses.

Also added the ability to have multiple email addresses in the to field.  Addresses are
separated by semicolons (;)  Example:

fox@someserver.com;j@another.com