- add __init__.py

- required by vtk library
- fixes error in CI

- install vtk via pip

- simplifies comparisons (ASCII)

Resolve "IsGroupTypeTrait not found if plugin in different namespace"

Closes #99

See merge request mechanics-and-materials/ae108!88

- add test in ae108::assembly namespace
- add test in other namespace (#99)

- required for plugins that are not in the ae108::assembly namespace

Resolve "Simplify assembler plugins with C++17"

Closes #97

See merge request mechanics-and-materials/ae108!86

- use if constexpr to simplify FeaturePlugin

Resolve "Consistently require C++17"

Closes #96

See merge request mechanics-and-materials/ae108!85

Resolve "Reorder matrices in canonical order"

Closes #95

See merge request mechanics-and-materials/ae108!84

- reorders elements of a matrix into canonical order
- simplifies interpretation of matrix elements (e.g. for debugging)

Resolve "Allow users to disable check "assertCorrectBaseMesh""

Closes #94

See merge request mechanics-and-materials/ae108!83

- disable check if AE108_CPPPETSC_DISABLE_BASE_MESH_CHECK is defined

Resolve "Serialize Eigen::Matrix of dynamic size"

Closes #93

See merge request mechanics-and-materials/ae108!82

- use index based access to avoid buffer

Resolve "Define default development environment"

Closes #88

See merge request mechanics-and-materials/ae108!77

Resolve "Add least squares solver"

Closes #86

See merge request mechanics-and-materials/ae108!75

- forces, stiffness matrix are assembled using displacements

- fixes error in CI

- avoid trade-off between energy optimization/boundary conditons

- e.g. forces were added multiple times

- use in transform creation

- processes without rows print "[]"