abstracted three orientation/location defining methods, and added functionality to define an affine from header
abstracted three orientation/location defining methods, and added functionality to define an affine from header
bthirion/nipy,alexis-roche/nireg,alexis-roche/nipy,alexis-roche/niseg,arokem/nipy,alexis-roche/niseg,alexis-roche/nipy,alexis-roche/register,nipy/nipy-labs,alexis-roche/nipy,alexis-roche/register,alexis-roche/nireg,bthirion/nipy,nipy/nipy-labs,arokem/nipy,nipy/nireg,bthirion/nipy,bthirion/nipy,alexis-roche/nipy,nipy/nireg,arokem/nipy,arokem/nipy,alexis-roche/register