SVT hit efficiency using Kalman tracks

[bloodyyugo]

Write an analysis to calculate the hit efficiency vs position on sensor using Kalman tracking. This has already been done for seed tracker and I'll use quite a bit of that code. The Kalman code already has implemented a reverse filter (used to get unbiased residuals); Robert has written a method to get the unbiased position at the sensor for tracks with and without hits at that sensor so this can be done easily using just a single tracking pass.