ed: if the bounding shape crash, leave an error, but do not crash ed2nav
type: StopTime is in VehicleJourney without indirection

This is the most instanciated object, thus we optimize it.

A Journey computation is 5% faster with this modification, and memory
almost the same (a little bit less).
type: externalize StopTime::comment

Small memory win (~5%), same performances
routing: fix typo in comment
Merge pull request #719 from TeXitoi/stop-points

Type: StopTime is in VehicleJourney without indirection