In order to have several set of reconstruction parameters and keep the synchronization between then we added the :class:`ReconsParamRegistry` to identify those reconstruction parameters with a simple int as id.

Then all potential class editing :class:`ReconsParam` will have to inherit from :class:`TomoParamsEditor` with the correct id. If no id is given then it will
create is own instance of `ReconsParam`

/close #299

Conflicts:
	tomwer/gui/darkref/darkrefcopywidget.py