[0.85] Do not use days for display of total durations : see #4284 for stats


git-svn-id: https://forge.indepnet.net/svn/glpi/branches/0.85-work@20468 35612d4c-9d10-0410-837c-bf9dd1be60d7
[0.85] Add more informations on massive actions errors see #4286
first example for doc


git-svn-id: https://forge.indepnet.net/svn/glpi/branches/0.85-work@20470 35612d4c-9d10-0410-837c-bf9dd1be60d7