void log_file(file, message)
string file;
string message;

Append a message to a log file. All log files are in the directory /log/ .
"/log/" is automatically prepended to the file name.

Examples:
	log_file("village.crap", message);
	log_file("snake.blah", message);

Note:
	The message must not contain '\n's.

	Don't log to to files in /players/<name>/ directories or to files
	in /d/<domain>/ diretories using write_file. Files in /log/ are
	automatically rotated by the system, e.g. /log/village.rep rotates
	to /log/village.rep.old .

	General logging of user actions etc. is forbidden. Also logging of
	output from user actions etc. via catch_tell is forbidden.

See also: efun/write_file