Tooltip component

[oliverp]

We need a tooltip component that looks neat and features:

• looks similar to the charting tooltips
• support for text with linebreaks
• timed and non-timed tooltips

An inspiration may be the echo extras tooltip container.

[ralfe]

Seems that next jQuery UI release will have some Tooltip component fitting to all that features
http://wiki.jqueryui.com/w/page/12138112/Tooltip
Maybe we could took this as some inspiration or even integrate the whole ui-component if it's stable enough