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This PR changes how non-shared arcs are merged, when possible.
Original codebase did not detect a single shared coordinate as junction and also start of geometries were not seen as a junction. This is changed in the last year and now this need some side solving of side effects.
The new approach detects which arcs were merged and set the merged linestring on the highest index of the arcs that are part of this merged linestring.
The remaining indici are collected and set to NaN, when bookkeeping for all other arcs are maintained. The implemented approach is very similar to the deduplication of duplicate linestrings.
A new test was added and all existing tests still pass.
Fix #104