Rosenbrock function tests

Reshniak, Viktorrequested to merge
rosenbrock into master

Files modified:

  • tests/test_functions.py implements new tests
  • model_zoo/Paraboloid_models.py renamed to model_zoo/TestFunctions_models.py
  • utils/optimizers.py added linear loss function
  • tests/test_multiscale.py changed import for TestFunctions_models

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