modifies getSpaxel to handle ModelCube
modifies getSpaxel to handle ModelCube

sdss/marvin,albireox/marvin,albireox/marvin,albireox/marvin,albireox/marvin,sdss/marvin,bretthandrews/marvin,bretthandrews/marvin,bretthandrews/marvin,bretthandrews/marvin,sdss/marvin,sdss/marvin