RE: :file keyword for Customize

[Stephen J. Turnbull]

Drew Adams writes:

 > This is about letting an individual option or face (or perhaps group) decide
 > where it is stored (and consequently let users decide when it is loaded). The
 > place to do that is in `defcustom' and `defface' (and perhaps `defgroup').

I think this is a YAGNI, and likely to lead to a plethora of confusing
custom files which appear at random times (ie, when you first save a
customization for a variable that targets that file).