Refactoring AMML handler functions

The handler registry ase_p_df and all referenced handler functions should go to a special module. Then get_ase_property should be rewritten: calc_name -> method_name, avoid use of generic, avoid results parameter (delegate mapping to handlers), delegate as much as possible to the the handler functions.

For example, this code

    {
     'calc_name': 'turbomole',
     'prop_name': 'transition_state',
     'internal_name': 'vibrational spectrum',
     'handler': tm_transition_state_handler
    }

will become something like

    {
     'method': 'turbomole',
     'property': 'transition_state',
     'handler': tm_transition_state_handler
    }

There are two methods to retrieve a property: from results list of dicts or from a list of calculators. The switching between the two methods can be done in the handlers. Because the handler is already bound to a method and a property the internal name and the method are not ambiguous.