add error estimator
- use L2 error norm of derivatives of the free energy - the error does not dercease with final crack (mabye its better to user energynorm) - working with brittle-fracture-half.py
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- use L2 error norm of derivatives of the free energy - the error does not dercease with final crack (mabye its better to user energynorm) - working with brittle-fracture-half.py