Dashboard - UI polishing and UX improvement

New Tree control

New Tree control that provides:

• Search a Dashboard
• Better user experience

Demo: https://www.dropbox.com/s/nqgz01p2epoht7w/dashboard_revamp1.mp4?dl=0

Portlet enhancements

Look-and-feel, icons cleanup and "no data available.." message/refresh button.

Tabular-to-graph switch on portlet

Switch from Graphical to Tabular representation of your data. That feature was available on a few portlet, it is made available on every portlet that can support that, on any aggregate dashboard.