Merge main (7431646) into Step A

Resolved against main's selection statistics, evaluator, decimal
SUMIF/SUMIFS/SUMPRODUCT, streaming XLSX reader and writer, hidden sheets
and import location:

- Selection statistics are kept per 64 rows on the blocks of the index
  of filled cells, made on first use and marked stale by set, delete and
  recalculation, so they take memory only where there is data; a dense
  index at the new grid would have been 268 M entries.
- The running aggregates are set up in main's evaluate() and survive
  its depth deferral: an extension abandoned part way keeps the rows it
  finished.
- SUMIF, SUMIFS and SUMPRODUCT keep main's terms functions for decimal
  arithmetic, over the sparse reads of masked.go.
- The streaming XLSX reader imports <cols> styles and row styles as line
  formats (a style on A and XFD as the sheet's), takes max-cells, and
  sets column widths without undo steps for the data's columns (at
  least 256) rather than all 16,384; the writer puts column and row
  formats in <cols> and styled <row>s. The excelize reference in the
  differential test does the same.
- A duplicated sheet keeps its line formats.

commit

bfb1a1824065b3ff1696937ca965d4e58f678276

parent

0fdf6cdc2d0f7415dd678aeca1fcb1c06fd9ae13

parent

74316463bdf4f40586ecb4c4c24f2d7a2de0021f

author

Dami <dami.etoile@gmail.com>