Refs #8570. Add initial test for saving functionality.
Refs #8570. Add method which saves fake column data.
Refs #8570. Add code do determine correct dimensions and test for it.
Refs #8570. Add code for saving the column data.
Refs #8570. Add support for multiple column types and test for it.
Refs #8570. Update documentation.
Refs #8570. Add code for writing attributes and test for it.
Merge branch 'feature/8570_saving_vector_columns' into develop