Fixing issue in HGTD digi when SiHit has same start and end position
As the title says, running some digi tests with the new samples I saw that it can happen that SiHits have the same local start and end position, no clue why this didn't come up before... This causes an issue with the way I have implemented the "direction" of the path along which charges are deposited. For sure there is a cleaner way to do this moving away from the Hep3Vector, but this just goes on the list for later improvements.