Remove numfieldcalls counter in TrackFieldExtrapolator base class
Intensive research and a bit of luck has finally peaked in these changes.
Hoping @nnolte has some time to review.
Reference Updates: !2219 (merged) Brunel!1076 (merged) Moore!624 (merged) which also go together with !2210 (merged) !2214 (merged) Moore!622 (merged)
Edited by Andre Gunther