Auto-refresh button for dashboards & every minute refresh rate

Two small features:
1. Auto refresh option for dashboards. This is a "naive" implementation that just reloads the whole dashboard object object every `max(60, min(queries refresh rate)*2)`. Better implementation will be to refresh just the queries that supposed to be fresh and a much better one will be websockets based.
2. Ability to set "every minute" refresh rate frequency for a query.