BUG/MINOR: stats: fix confirmation links on the stats interface

The confirmation link on the web interface forgets to set the displaying
options, so that when one clicks on "[X] Action processed successfully",
the auto-refresh, up/down and scope search settings are lost. We need to
pass all these info in the new link.
BUG/MINOR: stats: the status bar does not appear anymore after a change

When a server state change happens, a status bar appears with a link. Since
commit 1.5-dev16 (commit e7dbfc66), it was not visible anymore because of
the CSS properties set on the whole "div" tag used by the tooltips. Fix this
by using a specific class for the tooltips.