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WIP: Additon of Sparse iterative Linear solvers

Jens Wehnerrequested to merge
jenswehner/eigen:linear_solvers into master

Adding the linear solver BiCGSTAB(L) and IDR(S)STAB(L) to the sparse/linear_solvers module, according to #1875 (closed) These solvers are basically more stable and more expensive versions of BiCGSTAB.

  • Currently the implementations are basically one long function each. We will refactor those
  • General API advice is welcome. I am not sure, if the parameter L/S should be fixed at compile time or runtime
  • I am not sure about the code formatting.
  • Is there a C++03 compliant macro/replacement for auto
Edited by Jens Wehner

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