[0.85] improves logDebug (trace where called from)

git-svn-id: https://forge.indepnet.net/svn/glpi/branches/0.85-work@20788 35612d4c-9d10-0410-837c-bf9dd1be60d7
[0.85] fix logInfile

git-svn-id: https://forge.indepnet.net/svn/glpi/branches/0.85-work@20789 35612d4c-9d10-0410-837c-bf9dd1be60d7