Change the logging file name set

The date part is not set external, but internal via a flag.
The file name extension cannot be set anymore and the file_name_ext has
been removed and is now log_file_name_ext and privte.

This is a drop in solution and can be used with previous settings.

Changes that should be done:
Class.Login: remove the file name ext and replace it with log_per_class
= 1
Remove all file_name_ext entries as they area not needed anymore

www/libs/Class.Login.inc

@@ -100,8 +100,8 @@
 				exit;
 			}
 
-			// set log file name
-			$this->file_name_ext = '_login_'.date('Y-m-d').'.log';
+			// log login data for this class only
+			$this->log_per_class = 1;
 
 			// get the language sub class & init it
 			_spl_autoload('Class.l10n.inc');