Save All Files feature suggestion

[David Chapman <Zvona@MIT-OZ>]

In zwei in Release 4.1, System 222.186, Hardcopy 11.14, Zmail 74.43,
LMFS 30.26, site configuration 40, on Lisp Machine Four:

It would be featureful if when you gave Save All Files an argument it
would echoe ``Done.'' in the echo area at the bottom of the screen
instead of on the typeout window.