DataCube support

[marcschefer]

Example to load a whole data cube (with matching psf files in this case):

g1 = load_fits_data_cube('cube.fits', sorted(glob('sim11_g_??.psf')))

to load individual slices: DataCubeSlice('cube.fits', "nopsf", image_layer=3)

[ayllon]

Do we want to have datacubes on the check images or that is an overkill?

[ayllon]

Do we want to have datacubes on the check images or that is an overkill?

I answer myself. We do not do MEF check-images anyway.