Updating Bingham model explanation according to the code implemented.
Use Beverly and Tanner (1992) as a reference.

Add documentation of NorSand and Modified Cam Clay, parameters used and what they mean.

Describe the bug
When I compile cbgeo in docker, kahip and partio cannot be configured, but it shows configuring done. Is this a successful compilation?
-- HDF5: Using hdf5 compiler wrapper to determine CXX configuration
-- Checking for package 'KaHIP'
-- KaHIP could not be found/configured. (missing: KAHIP_LIBRARIES KAHIP_INCLUDE_DIRS KAHIP_TEST_RUNS)
-- Checking for package 'Partio'
-- Partio could not be found/configured. (missing: PARTIO_LIBRARIES PARTIO_INCLUDE_DIRS)
-- Configuring done
-- Generating done
-- Build files have been written to: /home/cbgeo/research/mpm/build

Bug description
In the user's documentation the keywords used to set the damping and the mpm scheme are not the same as in the code:

• stress_update in the documentation should be mpm_scheme (see this line in the code)
• damping_ratio in the documentation should be damping_factor (see this line in the code)

Beside not specifying the damping doesn't trigger a warning, but here it looks like it should. I think it's because of this if: if no damping is specified no error occurs so this catch never runs.
But maybe it would be better to open an issue on cb-geo/mpm for this problem?

Include nodal_euler_angles in JSON configuration.
Add the format of input file nodal_euler_angles_file which is CSV of node id and respective euler angles

Describe the feature

Add linear elastic material model to online documentation.

Layout

Inputs

List inputs:

• youngs modulus
• poisson ratio
• density

Defined values

Define calculated elastic moduli:

• bulk
• shear
• constrained

Define wave velocities:

• shear wave
• compression wave

References

Include references.

Style

Using the existing NorSand document as a guide.

Describe alternatives

Not include any linear elastic documentation online.

Additional context

It seems good to start documentation now as the linear elastic model is growing for use in earthquake MPM.