* Config rewrite. WIP

Simplified Config construction

More clear not frozen state in Config contructor

Simplified constructors for Config

Use new config for training. WIP

Removed "old style" config initializations

Removed unused docstring

* Use yaml to serialize config objects. Explicit assignment of Config attributes.
Updated tests.

mypy

mypy

fix test

* rebase with master

* Adressed Davids comments