) <D_tn_docs.html Method details>
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%  CGSolver                Matlab conjugate gradient (CG) method used to 
%                          solve for search direction {'symmlq'}
%    'symmlq'              Symmetric LQ method
%    'pcg'                 Classical CG method
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%  CGIters                 Maximum number of CG iterations allowed {5}
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%  CGTolType               CG stopping tolerance type used {'quadratic'}
%    'quadratic'           ||R|| / ||G|| <  min(0.5,||G||)
%    'superlinear'         ||R|| / |