Sects. 4.0 and 4.1 finished (barring minor tweaks).  Moved Sperling reference to follow Yamada in text
Merge branch 'nmssm2' of https://github.com/Expander/softsusy into nmssm2
Cleaned up Sec. 3 by improving sentence structure and small typographic changes such as widehats for chiral superfields (as in EHT - looks nicer) and consistent treatment of fractions.  A few typos fixed here and there.