Add new FTK uncertainty parametrization
This patch adds the new FTK track uncertainty parametrization, as discussed in FTKSIM-118. The new ftkparversion "FEB2019" is enabled by default, but the old versions ("DEC2017_V1", "LEGACY", as well as the NoIBL mode) are still included.
The new code is kept mostly separate from the old parametrization, in order to make it easy to remove the old code after the full validation of the new parameters.