* objects.c: #include "smob.h";

* objects.c: #include "smob.h";
(scm_class_keyword): Removed.  (Class is automatically created by
make_smob_classes.)
(scm_smob_class): Array of smob classes indexed by smobnum.
(scm_make_extended_class): "Plugin" function pointer for creation
of wrapper classes for smob and struct types.
(scm_class_of): Handle compiled closures.  (Currently regarded as
<procedure>.);
Use scm_smob_class to handle smob types;
Handle scm_tc16_bigpos, scm_tc16_bigneg, and, scm_tc16_keyword
through scm_smob_class;
Handle structs.
* smob.h (SCM_TC2SMOBNUM): New macro for conversion between tc16
type code and smobnum.