Python: Rich `type` column in MaD

[yoff]

This allows a dotted path in the type column of a MaD row. This means that

- ["foo", "Member[MS_Class].Instance.Member[instance_method]", "Argument[self]", "ReturnValue.TupleElement[0]", "value"]

can now be written

- ["foo.MS_Class", "Member[instance_method]", "Argument[self]", "ReturnValue.TupleElement[0]", "value"]

see the rewritten test models for more examples.

[yoff]

Don't forget to do a performance test (though I doubt we have anything that will actually exercise this code that much).

I kicked off a DCA run, but you are right that it might not show much until we really start using this...

[yoff]

The DCA run showed no degredation (no chnage at all, really, as expected).