Return the dimension of the current cell and the current table.
The result is a list (cw ch tw th c r cells) where cw is the cell
width, ch is the cell height, tw is the table width, th is the table
height, c is the number of columns, r is the number of rows and cells
is the total number of cells. The cell dimension excludes the cell
frame while the table dimension includes the table frame. The columns
and the rows are counted by the number of cell boundaries. Therefore
the number tends to be larger than it appears for the tables with
non-uniform cell structure (heavily spanned and split). When optional
WHERE is provided the cell and table at that location is reported.
(fn &optional WHERE)