Parses a RFC 822 compliant recipient list, such as that found in the To: header.
A string containing addresses, like in: Wez Furlong <email@example.com>, firstname.lastname@example.org
This string must not include the header name.
Returns an array of associative arrays with the following keys for each recipient:
|display||The recipient name, for display purpose. If this part is not set for a recipient, this key will hold the same value as address.|
|address||The email address|
|is_group||true if the recipient is a newsgroup, false otherwise.|