hexl-mode line length hardwired at 16

[Dan Jacobson]

   hexl-mode is an interactive compiled Lisp function in `hexl'...

   Each line in the buffer has an "address" (displayed in hexadecimal)
   representing the offset into the file that the characters on this line
   are at and 16 characters from the file (displayed as hexadecimal

And indeed, the '16' seems very much hardwired into the program. A
shame when say viewing files formatted at 14, 22 etc. lengths. Gotta
use hexdump -e instead.

By the way, I did M-x man hexdump here on debian and saw lines like
   %du, %iX, %ox,'
But not when I did man hexdump in the shell.
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