- eliminates unnecessary copies

- interprets matrix as vector

- avoids duplication of formulas

- disallows accidental calls

- disallows accidental calls

- avoids naming type twice

- signals that dimensions other than 2/3 are not supported

- avoids casts to/from floating point

- permits grouping members

Resolve "Build images in individual stages"

Closes #33

See merge request mechanics-and-materials/ae108!32

Resolve "Convert periodic boundary conditions to affine transform"

Closes #27

See merge request mechanics-and-materials/ae108!24