absolute path for GLPI_ROOT (__DIR__ is php >= 5.3)

git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@20007 35612d4c-9d10-0410-837c-bf9dd1be60d7
Manage dynamic items for dynamic items


git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@20008 35612d4c-9d10-0410-837c-bf9dd1be60d7