nmssmmanual: fixed typo in appendix and added definitions of gmsb parameters.
Now worried about clash of notation with lambda.
edited nmssmmanual: 'a MSSM' --> 'an NMSSM'.
edited nmssmmanual rges section to emphasise that Z3 violating RGEs are given in EHT.
Edited nmssmManual.tex:  Included paragraph on testing global min of potential
(end of Sect. 4.2), removed conventions table and included paragraph to
note SOFTSUSY conventions.  Small tweaks elswhere.
Merge branch 'nmssm2' of https://github.com/Expander/softsusy