bug#4941: hexl mode update (variable word size in hexl mode)

[Vivek Dasmohapatra]

On Wed, 11 Apr 2012, Lars Magne Ingebrigtsen wrote:

> Vengeance apparently kinda slow, but perhaps now is the time?
>
> The patch still mostly applies cleanly (one block fails), but I'm not a
> hexl user, so I can't really test the result with great confidence.
>
> Vivek, would it be possible for you to re-spin the patch (and test), and
> then I can apply it.

I've done some preliminary testing, seems to work (updated patch
is against master, but most of the relevant changes seem to have
happened during the emacs 23.x time frame anyway)

It's currently controlled by a defcustom, but maybe it should be
a prefix arg to hexl-find-file or hexl-mode instead? I don't
use hexl a huge amount myself so I'm not sure what its users
would prefer.

0001-Allow-hexl-mode-to-use-8-16-32-or-64-bit-hexl-word-s.patch
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