Cleanup 80, provide more generic parsing.
- Rename space-separated readMatrix to readGrid.
- Provide comma-separated readMatrix, remove loadMatrixFile.
- Rewrite parsing in library to use common generic parsing.
- Export generic parsing for 54.
- Use new readMatrix directly in 59.
- Replace loadMatrixFile with readMatrix in 81 - 83.
Cleanup 81-83.
- Push matrix walk routines into library.
- Simplify sum matrix initialization.