- Allows changing the uq settings whithout re-specifying the temporal variable while preserving the projection

- Unnecessary since spreadrate depends on raster

- Simplify examples

- Ensure having sf and raster attached in order to facilitate manipulation of sr_obs and results

and remove useless message from Readme

- Avoid more divergences of the model fit for common cases

filter_earliest_neigh(): identify earliest invasion dates for each neighbourhood represented by a point