[Enhancement] Swappable Packages (#216)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#216
Reviewed-by: liambrydon <lbry121@aucklanduni.ac.nz>
Reviewed-by: Tobias O <tobias.olenyi@envipath.com>

tests/test_multigen_eval.py

@@ -1,8 +1,12 @@
+from django.conf import settings as s
 from django.test import TestCase
 from networkx.utils.misc import graphs_equal
+
 from epdb.logic import PackageManager, SPathway
-from epdb.models import Pathway, User, Package
-from utilities.ml import multigen_eval, pathway_edit_eval, graph_from_pathway
+from epdb.models import Pathway, User
+from utilities.ml import graph_from_pathway, multigen_eval, pathway_edit_eval
+
+Package = s.GET_PACKAGE_MODEL()
 
 
 class MultiGenTest(TestCase):