Release: update module structure in setup.py so dist test runs

Author: sadielbartholomew

setup.py

@@ -300,13 +300,14 @@ def compile():
     packages=[
         "cf",
         "cf.mixin",
+        "cf.mixin2",
         "cf.data",
         "cf.data.array",
         "cf.data.array.abstract",
         "cf.data.array.mixin",
         "cf.data.collapse",
         "cf.data.fragment",
-        "cf.data.fragment.abstract",
+        "cf.data.fragment.mixin",
         "cf.data.mixin",
         "cf.docstring",
         "cf.read_write",