* ses.el (ses-cell-formula-aset): New macro.
(ses-cell-references-aset): New macro. (ses-cell-p): New function. (ses-rename-cell): Do no longer rely on complex operations like ses-cell-set-formula or ses-set-cell to change the cell and handle the undo at the same time, but rather use lower level new macros `ses-cell-formula-aset' and `ses-cell-references-aset' and handle the undo directly. Refresh the mode line.
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