Notify local recipients of locally-posted messages addressed to them.

While SBBSecho would notify local users of imported messages addressed to
them (both EchoMail and NetMail) and QWK-imported messages recently gained
the ability to notify local recipients of messages addressed to them, other
methods of posting messages (e.g. just using the normal terminal server
method, e.g. the 'P' command) or using any JavaScript (e.g. web) methods of
posting messages lacked recipient notifications. So that's now fixed.
And for JavaScript-saved local email messages too. I don't *think* this will
result in any duplicate notifications of received messages, but let me know
if you see excess/duplicate notifications.
Anonymously posted messages are excluded.
Messages posted to yourself are excluded (who does that?).