Make dashboard sidebar undock-able or remove sidebar totally

When you have more than 1 favorite dashboards, their names are listed in a sidebar that steels a whole bunch of useful space from your dashboard. This waist of space is even more painful if you use your screen vertically.

Two options to solve this:

• Add a undock button like you did for the brand new 6.0 issue navigator
• Give an option to completely hide the sidebar, since you can access your different dashboards from the pulldown menu (the sidebar is redundant with the menu and not really needed).