menus: enable revert-buffer-with-coding-system from dired

[Dan Jacobson]

Just wanted to let you know that in the menus,
having this choice blanked out when in dired,
    Set Coding System (up/down to change, PgUp to menu):
     ---For Reverting This File Now  (C-x RET r)
is not helpful.  It turned out to be just what I needed. So, giving up
on the menu, I just did C-x RET r instead.

(You see in my normally utf-8 world, I had mounted
/dev/hdc on /cdrom950 type iso9660 (ro,nodev,iocharset=cp950))

By the way, M-x shell, then revert-buffer-with-coding-system says it
needs a file associated. OK, so I write to /tmp/*shell*, but then
revert-buffer-with-coding-system causes a break with the process.
Therefore you need to figure out how to meld
revert-buffer-with-coding-system and *shell*. OK, discovered
set-buffer-process-coding-system. Never mind.

Is "File" the best word? Say "Buffer", and why are they all Caps?

Indeed, the menus are chock full of Caps. You'll get pulled over and
issued a grammar citation. Bad role model when only the first word is
supposed to be Caps.

Furthermore, and in conclusion, it is quite a challenge to get so deep
in emacs menus, holding down mouse buttons, not to mention ThinkCl*t.
I swear firefox doesn't do "all is lost (depth wise) if your hand
slips".

Anyway, I'll use tmm-menubar, which I discovered by accident one day
typing too fast.