fixed xflip for dwi datasets, added flipping of b0 image
fixed xflip for dwi datasets, added flipping of b0 image

braingl/braingl,rdmenezes/fibernavigator2,mhough/braingl,rdmenezes/fibernavigator2,braingl/braingl,TheProjecter/braingl,TheProjecter/braingl,mhough/braingl,braingl/braingl,mhough/braingl,TheProjecter/braingl