Hi folks!
Here's a patch to add colorized-REPL.
With Daniel's optional REPL printer patch, this one based on the former
would print colored result more pretty than guile-colorized. 
Thanks Daniel Hartwig!

And I didn't patch the doc to add an usage for this module, since it's
very easy, like (ice-9 readline):
-----------------cut-----------------
(use-modules (ice-9 colorized))
(activate-colorized)
-----------------end-----------------
And one may add these two lines to his/her '~/.guile'.

@ludo: I attached Daniel's patch in this mail, please apply in the order
if you accept them.

Thanks!