New functions (array-for-each-cell, array-for-each-cell-in-order)

* libguile/array-map.c (scm_i_array_rebase, scm_array_for_each_cell):
  New functions. Export scm_array_for_each_cell() as
  (array-for-each-cell).

  (array-for-each-cell-in-order): Define additional export.

* libguile/array-map.h (scm_i_array_rebase, scm_array_for_each_cell):
  Add prototypes.

* doc/ref/api-compound.texi: New section 'Arrays as arrays of
  arrays'. Move the documentation for (array-from), (array-from*) and
  (array-amend!) in here. Add documentation for (array-for-each-cell).

* test-suite/tests/array-map.test: Renamed from
  test-suite/tests/ramap.test, fix module name. Add tests for
  (array-for-each-cell).

* test-suite/Makefile.am: Apply rename array-map.test -> ramap.test.

* doc/ref/api-compound.texi: Minor documentation fixes.

libguile/arrays.c

@@ -28,7 +28,6 @@
 #include <stdio.h>
 #include <errno.h>
 #include <string.h>
-#include <assert.h>
 
 #include "verify.h"
 
@@ -551,7 +550,7 @@ SCM_DEFINE (scm_array_amend_x, "array-amend!", 2, 0, 1,
         { ARRAY_FROM_GET_O }
       scm_array_handle_release(&handle);
       /* an error is still possible here if o and b don't match. */
-      /* TODO copying like this wastes the handle, and the bounds matching
+      /* FIXME copying like this wastes the handle, and the bounds matching
          behavior of array-copy! is not strict. */
       scm_array_copy_x(b, o);
     }
@@ -569,7 +568,6 @@ SCM_DEFINE (scm_array_amend_x, "array-amend!", 2, 0, 1,
 }
 #undef FUNC_NAME
 
-
 #undef ARRAY_FROM_POS
 #undef ARRAY_FROM_GET_O
 
@@ -948,6 +946,7 @@ scm_i_print_array (SCM array, SCM port, scm_print_state *pstate)
     return scm_i_print_array_dimension (&h, 0, 0, port, pstate);
 }
 
+
 void
 scm_init_arrays ()
 {