* keep the notice-reply-placeholder around, but hidden
* insert things before the placeholder, rather than appending to the end of the list.
* append the active form after the hidden placeholder, so things inserted before the placeholder never come after it
* Realtime: check pre-existing notice visibility a second time after loading the HTML for a notice. Fixes bug where sometimes your own post would be shown twice because the Realtime notification arrived before the AJAX posting returned, but Realtime's AJAX fetch of the notice returned after.
Switch from manual local formatting of notices (which lacks all the server-side goodness) to calling into the server-side with an AJAX variant of shownotice.
We were clearing the counter on the window title in the blur event, which gets fired *after* we switch away, thus triggering Firefox to mark the tab as updated again.
Clearing the counter on *focus* instead avoids this, and keeps the counter out of the way as well.
