removing libreadline from base system

[Michel Talon]

>The only "problem" I see is from the ports lots of them relies on base
>libreadline, so we need to first run an exp-run without libreadline, to
>determine the impact and fix the related ports, before we can fully drop
>libreadline.

One of the first port to consider, i think, is rlwrap.  Some time ago i had to compile it on  a mac (which is equipped with libedit in place of libreadline) and it had problems since it calls functions in libreadline not in libedit .   So i was forced
to also compile libreadline. 

--

Michel Talon
talon at lpthe.jussieu.fr