Block-Based Matrix Multiplication Example

Code for simple matrix multiplication versus block-based version, written to experiment with whether a block-based version is actually faster. These are taken from a collection of example programs for CSCI 3366 (Parallel and Distributed Programming) and are therefore(?) more elaborate than they need to be. Main programs are matrix-mult-seq-simple.c and matrix-mult-seq-block.c; the other files contain functions used by one or both programs.