Merge request (list functions, t_scm_word/ssize_t)

Hi!

I've now (I hop so at least) fixed all the t_scm_fixnum vs. t_scm_word
and similar glitches that we've discussed so far. Also, I've
implemented most list functions found in R5RS, as well as making
equal? for lists O(1) in stack space:

* Made scm_pair_equal_fn() O(k) instead of O(n) in stack usage for
  nested lists, where k is the depth of the nesting, n the number of
  items.
 
* New list functions: scm_make_list(), scm_ref_list_elt(),
  `scm_set_list_elt (), scm_list_memq (), scm_list_memv (),
  scm_list_member (), scm_list_copy (), scm_append (),
  scm_append_x (), scm_list_reverse ().
 
* Tests for those.

All stuff can be found in my pika-scm--integration branch, if you only
want lists, there is a list branch, too. Note that I have established
another mirror of my archive on people.debian.org; you are encouraged
to use that instead of the mirror at stud3.tuwien.ac.at, since the
latter might be removed in the future (and may be less recent). See
http://yi.org/rotty/Software#gnuarch for details.

Andy
-- 
Andreas Rottmann         | [email protected]      | 118634484@ICQ | [email protected]
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