Compare severances with a hand-curated list

[dabreegster]

Related to #9 -- railways, rivers missing currently. https://umap.openstreetmap.fr/en/map/coupures-montpellier_993716#13/43.5959/3.8596 by @TFCx is a reference to compare to in Montpellier

[TFCx]

For Strasbourg, there's this one (made in 1994) :