ENH: added functionality and tests to list available indices and fetc…

…h sm-specific ones.

tests/idcindex.py

@@ -463,13 +463,13 @@ def test_cli_download(self):
 
     def test_list_indices(self):
         i = IDCClient()
-        assert not i.self.indices_overview.empty  # assert that df was created
+        assert not i.indices_overview.empty  # assert that df was created
 
     def test_fetch_index(self):
         i = IDCClient()
-        assert i.self.indices_overview["sm_index", "installed"] is False
+        assert i.indices_overview["sm_index", "installed"] is False
         i.fetch_index("sm_index")
-        assert i.self.indices_overview["sm_index", "installed"] is True
+        assert i.indices_overview["sm_index", "installed"] is True
 
 
 if __name__ == "__main__":