nmssmmanual.tex: added description of NMSSMTools flags for MICROMEGAS and NMSDECAY
Sfermion d.o.f. fixed in 1-loop effective potential of VhAtMin() of
nmssmsoftsusy.cpp.  Also fixed 1-loop factor (32 * pi^2) --> (64 * pi^2)
Fixed d.o.f. for charged Higgs in 1-loop effective potential of VhAtMin().
Included 2-loop prefactor alpha_s / (16 * pi^2) and split apart fermions
to avoid mixing up with 1-loop contributions.