Fix test_remove_group for new radical tree structure.

The specific groups used in the example have changed.
I came up with new example, that I think tests the same thing.

test/rmgpy/data/thermoTest.py

@@ -1670,15 +1670,15 @@ def test_remove_group(self):
         assert rad_group.entries["OJ"].data is group_to_remove.data
 
         # Remove an entry with a ThermoData object
-        group_to_remove2 = rad_group.entries["CsJ"]
+        group_to_remove2 = rad_group.entries["Cs_P"]
         rad_group.remove_group(group_to_remove2)
         # If group_to_remove was a data object, we point toward parent instead
-        # RJ2_triplet pointed to CsJ, which had data
-        # After we remove CsJ, RJ2_triplet points to the parent, which was RJ
-        assert rad_group.entries["RJ2_triplet"].data == group_to_remove2.parent.label
+        # CsCsJ pointed to Cs_P, which had data.
+        # After we remove Cs_P, CsCsJ points to the parent, which was CsJ
+        assert rad_group.entries["CsCsJ"].data == group_to_remove2.parent.label
         # If the parent pointed toward group_to_remove, we need should have copied data object
-        # RJ used to just point at CJ, which pointed at CsJ. After we remove CsJ,
-        # RJ should contain the data copied from CsJ
+        # CsJ (the parent) used to just point at Cs_P.
+        # After we remove Cs_P, CsJ should contain the data copied from Cs_P
         Tlist = [300, 400, 500, 600, 800, 1000, 1500]
         assert not isinstance(group_to_remove2.parent.data, str)
         assert group_to_remove2.parent.data.get_enthalpy(298) == group_to_remove2.data.get_enthalpy(298)