Before this patch, we used the default setting, which emits a HTML
<select> tag containing a list of *all* the users. We currently
have enough users that we do not want to load that complete list
every time. So now, use the autocomplete field instead.
Previously, the admin could not directly move from a report note to
its corresponding song. This commit adds a link that will go
directly to the "change" page for the corresponding song.
