Implemented some of grepwoods functions into the primary program

	new file:   FileIO/4*4Identity.mat
	modified:   FileIO/matrixdim.c
	modified:   Makefile
	modified:   MemoryAllocator/memory.c
	modified:   MemoryAllocator/memory.h
	modified:   Operations/checkoperations.c
	modified:   Operations/checkoperations.h
	modified:   main.c