[0.85] fix ticket recurrent next date


git-svn-id: https://forge.indepnet.net/svn/glpi/branches/0.85-work@20318 35612d4c-9d10-0410-837c-bf9dd1be60d7
[0.85] improve due date + progress display


git-svn-id: https://forge.indepnet.net/svn/glpi/branches/0.85-work@20321 35612d4c-9d10-0410-837c-bf9dd1be60d7