Allow tabs in Dashboard

[john_mahady]

... rather than the page metaphor. My visuals are hierarchical which fits nicely with tabs. But with pages the user has to find the page.

[v-ronewl]

It would be very useful to be able to create tabs on the dashboard. We would use this feature.

[jmwilliams83]

Don't understand why such a basic feature is not already available.

[#4]

Would be immensely useful in large dashboards/ datasets that can be tough to navigate via scrolling. Would add order and usability to dashboard consumers.