Closing Files

[FEINBERG at CMU-20C]

Howdy!
	Under twenex, why does Maclisp use restricted JFNs when you
open a file? This is very annoying when it is important to close 
a file, but you don't have a handle on it.  Yes I know about IOTA, but
sometimes you don't plan ahead, and sometimes you are using someone
elses code.  Either the JFNs should be unrestricted, or there should
be a lisp functions which closes all files, or you should at least be
able to specify UNRESTRICTED as a file mode to OPEN.