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[PL/SD] Compute eps_prev instead of storing it.

A small simplification exercise showing that for all processes the eps_prev can be removed w/o loss of performance. Same could be done with eps, but requires refactoring of secondary variables extrapolation.

Tested on LARGE ctest hollow-sphere. No measurable cpu-time difference. Memory is saved, there are 73.2MB less data allocated ~64bytes per integration point, which could be sizeof(eps_prev) x sizeof(double) + padding? = 6x8 + 24?

The only problem appeared for the back-filling (subdomain deactivation) case where a different strain was stored. This is a not so simple issue to be dealt with in the future.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added? Using existing tests.
Edited by Dmitry Yu. Naumov

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