Hello,

I find it tedious when looking at unprintables in Emacs just to have to
decode them from their octal to hexadecimal form for further lookup.
I've therefore written a patch that allows Emacs to display such
unprintables in hexadecimal format instead.  I'm not sure about the
naming though and whether a hardcoded secondary format string is the way
to go.  Once that's resolved, I'll add documentation to the patch.

Vasilij Schneidermann