Re: bootstrap from scratch

[Richard Stallman]

            * calendar/appt.el: Only activate appt if in an interactive
            session.  This stops appt from prompting during Emacs bootstrap.

Just loading appt.el probably should not activate the feature.
In the 90s it was not unusual for packages to work that way,
but when Custom was added it became common for a package to be
loaded simply because someone wanted to customize a variable.
So our convention, since then, is that just loading a package
shouldn't really change anything.

If appt doesn't follow this convention, we should change it to do so.