EmField d_hash() bugfix + tests updates

lodel/editorial_model/components.py

     def d_hash(self):
         return int.from_bytes(hashlib.md5(
                         bytes(
-                                "%s%s" % (  super().d_hash(),
-                                            self.data_handler), 
+                                "%s%s%s" % (  super().d_hash(),
+                                            self.data_handler_name,
+                                            self.data_handler_options), 
                                 'utf-8')
         ).digest(), byteorder='big')
 

tests/editorial_model/test_model.py

         grp2 = model.new_group('testgroup2')
         grp2.add_components((cls2, c1f2, c2f1, c2f2))
         grp2.add_dependencie(grp1)
-        e_hash = 105398984207109703509695004279282115094
+        e_hash = 94953339620599825962088463313192727554
         self.assertEqual(model.d_hash(), e_hash)
 
         c2f1.uid = 'foobar'
 
     def test_d_hash(self):
         """ Test the deterministic hash method """
-        field = EmField('test field', 'foobar')
-        e_hash = 16085043663725855508634914630594968402
+        field = EmField('test field', 'varchar')
+        e_hash = 46862393036804483771609032070241291172
         self.assertEqual(field.d_hash(), e_hash)
         field.uid = 'test field.'
         self.assertNotEqual(field.d_hash(), e_hash)