Von mises elastoplastic analysis #26
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-- rearranging ContextType in the template parameter list of member functions.
…e template parameter.
-- Bug-fixes for second derivative of vonMises stress
-- Refactoring of return mapping residual and Jacobian evaluations for von mises yield criterion
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This PR adds capabilities for elastoplastic analysis. This requires capability for storage of material point data (akin to quadrature point where the constitutive laws are enforced). Currently, von Mises yield criterion is implemented along with unit tests to check tangent stiffness.