Moby rewrite, which started out as some simple bug fixes.

Moby rewrite, which started out as some simple bug fixes.
Interesting points:

* New alternative names for some basic macros:

Type_Code --> pointer_type
Datum --> pointer_datum

* New predicates for certain types:

fixnum_p
character_p
string_p

* `Primitive_Error' and `Primitive_Interrupt' close-coded to save
space.  For extra savings, the following new procedures are available
(where N ranges from 1 to 10):

void error_wrong_type_arg_N ()
void error_bad_range_arg_N ()
void error_external_return ()

* M