improve gantt display see #4562


git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@22016 35612d4c-9d10-0410-837c-bf9dd1be60d7
Add link to gantt see #4562


git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@22017 35612d4c-9d10-0410-837c-bf9dd1be60d7