need previous grad_u values to compute trial state

adding details and stress function for J2 plasticity

linear elasticity example is completed with explanation and instructions

added tangent modulii implementation, computation speed comparable

adding possible examples with jax implementation

renaming notebook to small-strain elasticity

cleaning notebook

workign example for stress operator derivation from jax with akantu traditional…

using jax to automatically derive stress and tangent operator from energy…

started adapting standard constitutive laws to jax implemented laws

barycenter function corrected in python

added maximum damage limit for damage materials

Merge branch 'master' into features/34-poisson-solver-with-multiple-dofs

isotropic heat constitutive law added for poisson model

body stress functor for 1D cases also

user-defined body force example added for python

examples for body force/stress as boundary conditions added

body force and body stress boundary conditions added

major bug fixed in the assembleInternalForces

flatten internals added for phasefield model

making flux negative of gradient and subtracting internal dof from external dof

fixing minor mistake in poisson python wrapper

working python example for custom constitutive law added

writing python example for custom constitutive law, error with fe engine wrapper

custom constitutive law example added

working python example for poisson model with diffusion law added

python interface for poisson model and constitutive law added

working example for diffusion law added

parallel example for phasefield added

parallelization finished

poisson model complete with constitutive laws, tests/examples/python interface…

inline fucntions for poisson added

stable time step and assemble capacity generalized

Merge branch 'master' into features/34-poisson-solver-with-multiple-dofs

added diffusion and heat as constitutive laws, still incomplete

Merge branch 'master' into features/38-damage-energy-computation-missing-in…

parrallelization of pahsefield model started

generic poisson model and constitutive laws added, still incomplete

python binding for conductivity on quadrature points

adding python wrappers for additional functions in heat transfer model

added bondary condition inheritance to heat transfer model

bug in energy compuatation fixed

Merge branch 'master' into features/38-damage-energy-computation-missing-in…

dissipated energy computation added

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