bug#46002: 27.1; Offer to replace characters with notation

[積丹尼 Dan Jacobson]

Got an idea. You know that message:

    Non-printable characters found.  Continue sending?

    d: delete                r: replace               s: send                  
e: edit
    Remove non-printable     Replace non-printable    Send as is without       
Continue editing
    characters and send      characters with "."      removing anything
                             and send

Well that's great, but,
how about also:
h Replace them with hexadecimal notation. e.g., \x92
o Replace them with octal notation. e.g., ...
q Replace with Quoted Printable notation. e.g., .... (But maybe q (or n)
  should be for quit (or "no"). Especially as you ask two questions in the same 
sentence:

 "Non-printable characters found.  Continue sending? (delete, replace, send, 
edit, ?): "
 But then totally forget to give the user          ^a choice for this 
question!!)