Use a default NMSSM parameter point which has no tachyons
let the user decide what to do in case of errors.
Set the tree-level goldstone boson masses to the masses of the
corresponding vector bosons.  This is the first step towards
Softsusy's way of inputting Mu and BMu at Msusy (at the one-loop
level), without violating the tree-level Slavnov-Taylor identity
between the goldstone boson and vector boson masses (in Rxi gauge
for xi = 1).