existing message-ID if it's already been created for this message.

existing message-ID if it's already been created for this message.

No longer creates blank (empty) header fields if they don't exist in SMB.

Fixed minor bug in storing recipient and reply-to net types (over allocating).
Fixed cosmetic bug in undeliverable message report (null) instead of user name.
Switched to COMMENT header field for SMTP system messages and deprecating
use of SMTPSYSMSG header field.

(for use in smbutil and like-applications when displaying/debugging headers).
Created convenience pointer to SENDERORG header field (msg.from_org).

(for use in smbutil and like-applications when displaying/debugging headers).

(advanced sysop command for debugging purposes).

When exporting a message that is a reply to another, but it doesn't have a
FIDOREPLYID header field, the original FTN message ID is looked-up and used.

if the message base is open by another process at the time of packing). The
data files should no longer be left in a mis-matched state if this happens.

(e.g. digital.man@vert.synchro.net.remove-xyz-this)

Using memset() inplace of non-standard strset().

original messages's data, but it didn't increment the data allocation counter
for the data blocks. Now uses the new smb_incmsg() function to increment
the allocation counters, so if the original message is free'd, the data blocks
will not be prematurely reused.

NO_LOCAL_FSYS).

error handling than opening in the constructor.
Using JS_ReportError to report fatal (scripting ending) errors.
Using the SMB status attributes to determine E-mail message bases.
New is_open property.
Hid debug property (currently unused).