Class organization refactor

[rluce]

At current state both TLMat and ToepMat are sitting in one monolithic file. Matlab's indention rules (class/methods/fuction) induce a lot of whitespace noise in the code, making it difficult to maintain the 80 char line width limit.

Instead the two classes should sit in the own directories, with each method becoming its own file. This is described in the Matlab documentation for OO development.