function to set properties reflecting configuration info of the open sub-board.

Fixed subject, to, and from CRCs in message base index (lowercase conversion).
Fixed memory leak if message base constructor failed.
Added support for USENET Path and Newsgroups header fields.
Added optional parameter to get_msg_header to force regeneration of msg-ID.
 - this solves the dupe-loop problem in newslink.js with messages imported with
 - QWKnet MSGIDs.

reply_id property is not created if it doesn't exist in the msg header.
msg.id is based on the time the message was imported rather than written.

Added ftn_pid, ftn_area, and ftn_flags header fields/convenience ptrs.

indicating whether the message is to be rfc822-encoded or not (defaults to
false). This solves the problem of the nntp service and newslink module sending
messages with dots in the first character of a line incorrectly.

reply_id properties and place them in the appropriate SMB header fields.
get_msg_header() method defines only the following properties as read only:
number, id, and reply_id - the rest are now read/write.

Added extra bool param to get_msg_body method (tails).
Created get_msg_tail() method.

addresses (QWK, FidoNet, and Internet).
Changed faddrtoa() prototype.

Now uses RFC822 message-id and reply-id if defined in SMB message header.

open and return null if it isn't.
save_msg method now truncates white-space off end of message body.

(currently read-only).