Added global bool GUTlamnda.
When GUTlambda = true input lambda is set at the GUT scale.
 When GUTlambda = false input lambda is set at MSUSY.
Merge branch 'nmssm2' into read-nmssm-slha
Input lambda at the GUT scale per default

Later the user could set lambda in QEXTPAR which will then be
input at the susy scale.