more icc input profile sanity tests
more icc input profile sanity tests

check colourspace too, so we won't try to import an RGB image with a LAB
profile

see https://github.com/jcupitt/libvips/issues/730

lovell/libvips,jcupitt/libvips,jcupitt/libvips,lovell/libvips,lovell/libvips,jcupitt/libvips,lovell/libvips,jcupitt/libvips