Communication CPU <=> GPU

Topics
	copyvector: GPU => GPU
	getvector: GPU => CPU
	setvector: CPU => GPU
	copymatrix: GPU => GPU
	getmatrix: GPU => CPU
	setmatrix: CPU => GPU
	getmatrix_transpose: GPU => CPU
	setmatrix_transpose: CPU => GPU
	getmatrix_bcyclic: multi-GPU => CPU
	setmatrix_bcyclic: CPU => multi-GPU

Detailed Description