Add code for SSPMS43 and update computations for SSP LMM.
Update nosetests for SSPMS32.
Mostly adding comments.
Removing unnecessary variables.
Using deepcopy for stages of starting methods.
Merge pull request #403 from hadjimy/ssp_lmm_vss

Add code for SSPMS43 and update/correct computations for SSP LMM.