Ensure lines in Line.reconcile is a list

Line.reconcile can append lines to the parameter lines that's why it is
duplicate but it must also ensure it is a list.

issue4623
review9071002

move.py

@@ -1517,7 +1517,7 @@ class Line(ModelSQL, ModelView):
                 cls.raise_user_error('already_reconciled',
                         error_args=(line.move.number, line.id,))
 
-        lines = lines[:]
+        lines = list(lines)
         reconcile_account = None
         reconcile_party = None
         amount = Decimal('0.0')