Bootstrap upgrade, notion of group and others...

This request contains : 
- SQL script to apply the new changes
- Export and import of dashboard and array of dashboards
- Notion of group for the dashboards and the checks
- Major evolutions on the page "view_dashboard"
- The upgrade of bootstrap and all its consequences on the CSS and classes (and other)
- The upgrade of jquery-ui
- Reorder the graphs and the lines by up and down arrow or drag and drop (this last needs the upgrade of jquery-ui)