Add derivatives and Hessians to test functions in argmin_testfunctions

[stefan-k]

Currently, the derivative and Hessian computation are only implemented for the Rosenbrock test function. The library would be most useful if most (if not all) other test functions had derivatives and Hessians as well. I've decided to open this issue in order to track the progress of this. If anyone is interested in taking on some (or all) of these, feel free to do so.

• Ackley #447
  • [x] Derivative
  • [x] Hessian
• Beale #423
  • [x] Derivative
  • [x] Hessian
• Booth #426
  • [x] Derivative
  • [x] Hessian
• Bukin No. 6 #427
  • [x] Derivative
  • [x] Hessian
• Cross-in-tray #441
  • [x] Derivative
  • [x] Hessian
• Easom #428
  • [x] Derivative
  • [x] Hessian
• Eggholder #435
  • [x] Derivative
  • [x] Hessian
• Goldstein-Price #440
  • [x] Derivative
  • [x] Hessian
• Himmelblau #437
  • [x] Derivative
  • [x] Hessian
• Holder table #443
  • [x] Derivative
  • [x] Hessian
• Levy #449
  • [x] Derivative
  • [x] Hessian
• Levy No. 13 #448
  • [x] Derivative
  • [x] Hessian
• Matyas #432
  • [x] Derivative
  • [x] Hessian
• McCorminck #439
  • [x] Derivative
  • [x] Hessian
• Picheny #445
  • [x] Derivative
  • [x] Hessian
• Rastrigin #421
  • [x] Derivative
  • [x] Hessian
• Rosenbrock #411
  • [x] Derivative
  • [x] Hessian
• Schaffer No. 2 #433
  • [x] Derivative
  • [x] Hessian
• Schaffer No. 4 #433
  • [x] Derivative
  • [x] Hessian
• Sphere #422
  • [x] Derivative
  • [x] Hessian
• Styblinsky-Tang #446
  • [x] Derivative
  • [x] Hessian
• Three-hump camel #444
  • [x] Derivative
  • [x] Hessian