Update for 7 SVT layers, to 14 modules.

[mholtrop]

Need to fix the hard coded double in SvtTrack.h.
Should that have been a vector from the start? Change covmatrix to vector as well.

[mholtrop]

Need to change GblTrack also.

[mholtrop]

Dang. Schema Evolution in ROOT just isn't up to the task of allowing both old and new data formats in this case. At least it seems to not allow a double array to a vector. No response on the ROOT Forum for my questions, so it seems that this is simply broken now. See: https://root-forum.cern.ch/t/schema-evolution-for-double-isolation-12-to-vector-double-isolation-in-a-split-ttree-read-is-not-working/35304

I will try to move to double isolation[14], which may just work.