Changes from Gaudi integration backported into Cross Kalman. * Matrix types are now simplified in oldfit's Track-types, fit contiguous Track-types and fit vector Track-types. * Scheduler is used for all iterations. * Transposition is done prior to computation, due to scheduler being precalculated. * The conditions are similar to what Gaudi TrackVectorFitter does. * Schedulers have slightly been reworked, to support arbitrary lengths. * Scheduler now gives indexes relative to the track and nodes, as opposed to iterators (this is more architecture portable). * Compatibility has been checked against gcc 6.2 and icc 17.0. Both sequential and vectorized.