merge bugfix from upstream
merge utils.h from upstream/nmssm2
remove unused functions
merge helper function from upstream/nmssm2
merge optimizations from upstream/nmssm2
merge def.{h,cpp} from upstream/nmssm2
decrease the default precision to 10^-4 which is the default in Softsusy
add missing include (needed for ToValarray())
help the user on how to use the helper functions for spectrum plotting