hexl-find-file doesn't know read-only

[Dan Jacobson]

hexl-find-file does not notice that a file is read-only on the disk
making the new buffer read-write.  Plus I see it uses
find-file-literally, who's docs say not to use it in lisp programs.

By the way, why must Flyspell and Fill get turned on for me when I'm
hexl-find-file'ing? All I do in .emacs is
(setq default-major-mode 'text-mode)
(add-hook 'text-mode-hook (lambda ()
   (flyspell-mode 1)
   (turn-on-auto-fill)))

By the way, it bugs me that hexl's C-e, hexl-end-of-line, gets the
cursor to two columns earlier than the end of line. If I want to copy
and paste that line, C-@ C-e ESC w, I must use the mouse instead.
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