corrected doc typo
improved run-tests
change loop for mat-mat multiply to do two columns at once (except for n=2)
change mat-mat to do two columns of result at once when n=2
change loop for piped mat-mat multiply to do two columns at once (except for n=2)
 change piped mat-mat to do two columns of result at once when n=2
added another test
code tweak
improve speed of piped mat-vec routine
used CFLAGS in makefile