NIL when no tests or tags are defined.  Check that PACKAGE-TABLE gives us a hash table.
Ensure that the tags table is a hash table.
Directly call MAKE-INSTANCE to avoid changing the list of applicable methods.
Cut end-of-line whitespace.
Ignore CCL fasls.
New macro, equivalent to ASSERT-FALSE, under the more helpful name ASSERT-NIL.
Merge branch 'feature/flexible-list-tests-and-tags' into develop