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(ses-center, ses-center-span): Use them.
(ses-print-cell): Bind them while calling the printer.
(row, col, maxrow, maxcol): Don't declare as dynamically scoped.
(ses-dorange): Revert last change.
(ses-calculate-cell): Don't bind row&col dynamically while evaluating
the formula.
(ses-set-cell): Avoid `eval'.
(ses--time-check): Rename it from ses-time-check and turn it into
a macro.

Fixes: debbugs:18191