Set script type to latin for formula cells with numeric results.

But only when the column contains only standard number format types.

Change-Id: I83982d2e87f9776cf03754beaf183e35675be992
Be sure to copy the cell text attributes values to and from clip.

Otherwise we'd have to unnecessarily re-calculate the script types again
which is not cheap...

Change-Id: Ie589fb4a7e5ec9b5ef646dabea4e6bd0c0aca560