* filenotify.el: New package.

* filenotify.el: New package.

* autorevert.el (top): Require filenotify.el.
(auto-revert-notify-enabled): Remove.  Use `file-notify-support'
instead.
(auto-revert-notify-rm-watch, auto-revert-notify-add-watch)
(auto-revert-notify-handler): Use `file-notify-*' functions.

* subr.el (file-notify-handle-event): Move function to filenotify.el.

* net/tramp.el (tramp-file-name-for-operation): Handle
`file-notify-add-watch' and `file-notify-rm-watch'.

* net/tramp-sh.el (tramp-sh-file-name-handler-alist): Add handler
for `file-notify-add-watch' and `file-notify-rm-watch'.
(tramp-process-sentinel): Improve trace.
(tramp-sh-handle-file-notify-add-watch)
(tramp-sh-file-notify-process-filter)
(tramp-sh-handle-file-notify-rm-watch)
(tramp-get-remote-inotifywait): New defuns.