Added two functions to the matrix library:

`(vov->matrix vov)`

- converts a vector of vectors to a matrix`(matrix->vov m)`

- converts a matrix to a vector of vectors

Quick and simple, but highly useful for testing and display purposes.

Added two functions to the matrix library:

`(vov->matrix vov)`

- converts a vector of vectors to a matrix`(matrix->vov m)`

- converts a matrix to a vector of vectors

Quick and simple, but highly useful for testing and display purposes.