rlwrap as alternative to readline linking

[Przemek Klosowski]

I don't know if it's useful or not, but I stumbled onto the utility 
'rlwrap' that intercepts stdin/out of commandline programs and provides 
readline capabilities. This way the wrapped program doesn't have to 
worry about the intricacies of readline libraries/language support/etc.

This is how maxima handles command line editing---the underlying maxima 
executable uses the simplest commandline I/O, and rlwrap provides 
advanced editing functionality for the rmaxima version. I am pretty sure 
that works on Windows as well, so maybe using it would simplify the 
Octave build process.