fix typos in NMSSM instructions.  started some E6SSM parts.
Merge branch 'master' of ssh://pktlogin.phy.tu-dresden.de/soft/users/theory/FlexibleSUSY
fix compile-time error

One cannot create a matrix of type Derived if the arguments to Diag()
is a product of matrices.
Merge branch 'master' of ssh://pktlogin.phy.tu-dresden.de/soft/users/theory/FlexibleSUSY