v4.0.2

• issue: Clear warnings issued on 'busiest' panel when interface traffic is zero
• issue: Ensure that panels with links use callbacks
• issue: Vertical scroll bar was not appearing on some themes
• issue: Fix javascript for displaying topX graph
• feature#208: Add select all to permissions tab
• feature: Add DNS resolving check
• feature#203: Add dashboard sharing
• feature: Change default permission - allow user level panels for new user