Updated norm_2 (added new), #554
Updated reshape (removed old), #554
Updated reshape (added new), #554
Updated veccat, flattencat, vecNZcat, flattenNZcat, vecNZ, flattenNZ (removed old), #554
Updated veccat, flattencat, vecNZcat, flattenNZcat, vecNZ, flattenNZ (added new), #554
Refactored Matrix printing, #554