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

[Vivek Dasmohapatra]

So, is anyone going to look at this? Vaguely encouraging noises were made 
the first time I submitted it, but that was many months (possibly even a 
few years) ago now, and no-one seems to have taken any interest in it since:
I don't mind if it's not wanted, but I'd rather know one way or another.