changing the type-specifier. Use a lisp type of (OR NULL FOO)
for a specified-type of FOO unless :db-constraints :not-null.
No need to specialize finalize-inheritance for openmcl.
+ Handle differences in direct-slot-definition values which
+ are now listify by openmcl 14.2.
* tests/test-*.lisp: Rename fields so that joins occur on
fields with different names. This ensures that join code is
selecting the proper name.