Except for ses-prin1, the other standard printers are suitable
only for cells, not columns or default, because they format the value
using the column-printer (or default-printer if nil) and then
center the result:
ses-center ¶Just centering.
ses-center-span ¶Centering with spill-over to following blank cells.
ses-dashfill ¶Centering using dashes (-) instead of spaces.
ses-dashfill-span ¶Centering with dashes and spill-over.
ses-tildefill-span ¶Centering with tildes (~) and spill-over.
ses-prin1 ¶This is the fallback printer, used when calling the configured printer throws some error.