New feature of the Railfinder journey planner live today: avoiding station changes that require a metro or similar

We now consider transfers in three levels: within a station, walking between nearby stations, and changes that require local transit.

If the fastest journey possible requires a worse change of stations, we calculate other options that have easier transfers. And we promote the easier journeys higher in the list of results.

For example going Brussels - Barcelona skipping Paris ⤵️

@stefanlindbohm this is an awesome improvement. Changing trains in Paris can be... interesting.