Optimize matadd sss#210
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MATADD_SSS and MATADD_SSS_NTERM rewritten with a simpler and much faster algorithm.
Massive speedup for big eigen (103/105) models which add the global stiffness and mass/differential stiffness matrices. Eg: A 262000 element CQUAD4 SOL103 problem took 40 minutes for those two calls before and now takes 0.1 s. (10000 x speedup!)
Should be generally faster for the many other uses of MATADD_SSS too.
Removed DEBUG,81 which was reporting internal details of the old sparse addition algorithm that are no longer present, as well as general comments and stats that don't seem to be any use.