more fixes to equal? for arrays

more fixes to equal? for arrays

* libguile/array-map.c (array_compare, scm_array_equal_p): Rewrite as
  something that operates on the generic array handle infrastructure.
  Based on array->list.
  (scm_i_array_equal_p): Change the docs, as array-equal? is now the same
  as equal?, except that it typechecks its args.

* doc/ref/api-compound.texi (Array Procedures): Update array-equal?
  docs.

* libguile/deprecated.h:
* libguile/deprecated.c (scm_raequal): Deprecate.

* libguile/bytevectors.c (scm_bytevector_eq_p): Bugfix: bytevectors are
  bytevector=? only if their element type is the same.

* libguile/eq.c (scm_equal_p): Only dispatch to scm_array_equal_p if
  both args are arrays (generically).

* test-suite/tests/arrays.test ("equal?"): Add some more tests.