v0.5.1

Rain from the stations, not the model.

• Withdrawn: ERA5-Land precipitation (precipitation_change.tif and the precipitation,
  evaporation, soil moisture and snow cover columns of v0.5.0). Checked against 10 long
  station records it puts 2023 at about half the normal rain where every station measured
  102-118%, and shows summer drying most stations do not. Do not use the v0.5.0 files for rain.
• Rain as measured at 10 stations (4 AEMET, 6 Météo-France): rain_stations.gpkg, with
  the change per year and season. The yearly total has hardly changed; springs are drier and
  autumns wetter.
• Station check extended to AEMET (Hondarribia, Igeldo, Bilbao, Pamplona) and three
  Zuberoa stations; temperature results unchanged.
• Website: seasonal rain map in chapter 06; the stripes now sit below the chapter text.
• RustGIS project: Klima aldaketa group (Tenperatura, Prezipitazioak stations).

Assets added: rain_stations.gpkg, station_check.csv. Removed: precipitation_change.tif.

Data: CC BY 4.0 (climate stations: © AEMET, © Météo-France), except elevation (Copernicus WorldDEM-30 licence) and peaks (ODbL, © OpenStreetMap contributors); see ATTRIBUTION.md. Code: MIT.