Notification should describe problem attributes

• Notification node should have "icon-invisible" if user receives a suppressed notification.
• Notification indicator should blink accordingly with general trigger displaying options:
• If unacknowledged/acknowledged problem events are blinking.
• Timeout the notification to blink for on status change.
• The setting "Display OK triggers for:" should override message timeout setting and resolved messages should not be displayed for any longer than that.

Open discussions:

• Do we show maintenance icon for host name?
• Do we show popover "suppressed till.." for "suppressed problem" icon?