subtypep: handle COBJ inheritance.

* lib.c (class_from_sym): New static function.
(subtypep): Remove special case handling of stream versus
stdio-stream. If the two types are not both structures, then
check whether they are both cobj classes. If so, check if they
are in an inheritance relationship via the cobj_hash.
(cobj_populate_hash): Map each symbol to a fixnum integer
which gives class handle'position in the cobj_class table.
(cobj_class_exists): Style: compare to nil instead of 0.
(obj_init): Do not call cobj_populate_hash here, it is far too
early: only a couple of COBJ types exist at this point.
Moreover, hash_init has not been called so hash_cls and
hash_iter_cls still have null symbols.
(init): Call obj_populate_hash here, as the last step.

* tests/012/type.tl: New file.

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