struct: rework stype_handle change.

The change which allows stype_handle to recognize struct
instances, and obtain their type, has some possibly unwanted
ramifications, since the function is widely used.
Let's refactor things so that, for now, only the
struct_type_name function takes advantage of this flexibility.

* struct.c (stype_handle_impl): New static function, copy of
stype_handle, but taking an obj_ok Boolean argument to
indicate whether an object instance is an acceptable argument,
whose type should be fetched.
(stype_handle): Now a wrapper around stype_handle_impl passing
nil for the obj_ok argument.
(stype_handle_obj): New static function. Passes t for the
ok_obj argument of stype_handle_impl.
(struct_type_name): Call stype_handle_obj instead of
stype_handle.
(super): Take advantage of stype_handle_obj to reduce code.

* txr.1: Update documentation of struct-type-name, and improve
that of super.

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