Update SPM data model according to NIDASH calls on 16th of Dec, 6th and 13th of January

* Create two activities `model_fitting` and `contrast_estimation` in place of `statistical_estimation`
* Remove `coordinateSystem` in peak `coordinate`s
* Create two `coordinateSpace` entities to extract `voxelToWorldMapping`, `voxelUnits`, `voxelSize`, `coordinateSystem`, `dimensions` and `numberOfDimensions`. The first `coordinateSpace` entity is member of `data_scaling`, `beta_map_1`, `beta_map_2`, `residual_mean_squares_map`, `contrast_variance_map`, `contrast_map`, `statistical_map` and `excursion_set`. The second `coordinateSpace` is member of `search_space`.

I used a `hadMember` relationship between `coordinateSystem` and other entities but I do not know if this is the right thing to do.