Make `ses--symbolic-formulas' a safe local variable.
(ses-mode-print-map): Add `c' and `t' (suggested by Gareth Rees). (ses-recalculate-cell): Deal with point being just beyond end of data area (why does this happen?) (ses-set-curcell): Ditto. (ses-column-letter): Handle columns beyond 702. Code written by Gareth Rees.
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