deprecate generalized vectors in favor of arrays

deprecate generalized vectors in favor of arrays

* libguile/generalized-arrays.h:
* libguile/generalized-arrays.c (scm_c_array_length):
  (scm_array_length): New functions.

* module/ice-9/deprecated.scm:
* libguile/generalized-vectors.c:
* libguile/generalized-vectors.h:
* libguile/deprecated.h:
* libguile/deprecated.c (scm_generalized_vector_p)
  (scm_generalized_vector_length, scm_generalized_vector_ref)
  (scm_generalized_vector_set_x, scm_generalized_vector_to_list):
  Deprecate.

* libguile/uniform.c (scm_uniform_vector_to_list): Use
  scm_array_to_list.

* module/ice-9/boot-9.scm (case): Arrays are generalized vectors.

* module/srfi/srfi-4/gnu.scm (define-any->vector): Use the array
  functions instead of the generalized-vector functions.

* test-suite/tests/arrays.test: Remove generalized-vector->list test;
  covered by array->list test.

* test-suite/tests/bitvectors.test:
* test-suite/tests/bytevectors.test:
* test-suite/tests/srfi-4.test: Adapt to test using array interfaces
  instead of generalized-vector interfaces.

* doc/ref/api-compound.texi: Remove generalized vector docs.
* doc/ref/api-data.texi:
* doc/ref/srfi-modules.texi: Adapt.