for initial evaluation. .nodeset or .ic have never set CKTrhsOld,
so initalization for B source failed.
We still have to check why .nodeset and .ic are set two times,
first in CKTic(), then in CKTload()!
checked for object file invariance on linux with
./configure --enable-debug=no --enable-maintainer-mode --with-readline=yes --enable-cider --enable-ndev --enable-pss --enable-xspice