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LocalADOLCStiffness: use "hessian2" instead of "hess_vec"

Merged Patrick Jaap requested to merge feature/adolc-alternative-modes into master

With this commit, we do two things:

  • replace "hess_vec" with a simpler call of "hessian" which calls internally "hess_vec".

  • use "hessian2" by default instead of "hessian". "hessian2" calls internally "hess_mat" which is faster than "hessian/hess_vec". If the user encounters probems with the new "hessian2" driver, a boolean "useHessian2" can be set to false in the constructor.

Edited by Patrick Jaap