[MERGE-REQUEST] `wcp-equal-predicate' and more

[Ludovic Courtès]

Hi,

Here are the latest news from my tree:

  patch-19
      Documented the C types available in the standard wrapset.
  patch-20
      Added support for the `wcp-equal-predicate' of `<gw-wct>'.
  patch-21
      Documented `wcp-equal-predicate'.
  patch-22
      More Guile 1.7 updates: booleans, `scm_is_eq ()', `scm_is_null ()'.

Patch 20 is quite nice.  Maybe someday we'll also add support for
`print' as well.  The problem with `print' is that it's very Guilish
and, well, I don't really need it right now.  ;-)

As for patch 22, I only tested it with Guile 1.7.

Let me know how it goes.

Thanks,
Ludovic.