The attached proposed patch adds a defcustom and makes a change to two
existing functions in order to allow a user the option to only have
autorevert mode operate on visible buffers. The change to function
'after-find-files' may also fix a bug (or change behavior) in that
sometimes when being prompted to manually revert a buffer that had been
in auto-revert-mode, the auto-revert-mode status would be lost, ie. set
to nil.

Use of this feature:

1) Reduces CPU workload when using autorevert

2) Reduces messages when using `auto-revert-verbose'

Possible disadvantage:

1) When making a buffer visible, it might take as long as
   'auto-revert-interval' seconds for any accumulated changes to
   auto-revert. The default for that value is five seconds.

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