Return value of `energy`

[ivnsch]

The energy function states that it returns a float: https://github.com/forlilab/waterkit/blob/master/waterkit/autodock_map.py#L396-L397

but it seems to return a float or an array: https://github.com/forlilab/waterkit/blob/master/waterkit/autodock_map.py#L437-L440

The parameter sum_energies https://github.com/forlilab/waterkit/blob/master/waterkit/autodock_map.py#L386 seems not to be used, so effectively always a float is returned? would it make sense to remove the array return and this parameter?