James Dunkerley 19f15b8f97 Small fixes from building up another demo. (#9385) ... - Fix `Excel_Workbook.sheet` and add a test. - Add icon for `Table.row_count` and `DB_Table.row_count`. - Make `join_kind` widget `Display.Always`. - Add expression as an option to `Aggregate_Column`. - Add `Simple_Calculation.Copy` to create a copy. - Add defaults to `Simple_Expression` so less errory. - Set period to default to day for `date_diff` allowing use in expressions. - Add `Text_Left`, `Text_Right`, `Text_Length` and `Format` to `Simple_Expression`.		2024-03-13 18:13:33 +00:00
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Standard	Small fixes from building up another demo. (#9385)	2024-03-13 18:13:33 +00:00