git-notify: Don't generate duplicate notifications

Never notify on a given commit more than once, even if it's referenced
via multiple branch heads.  We make sure this won't happen simply by
maintaining a list of commits we notified about.  The file path used for
saving this list can be specified using the new "-t" option.  (The
contrib/hooks/post-receive-email script distributed with Git tries hard
to avoid such a list, but it doesn't get the necessary magic right.)

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