Spreadsheet insert/remove Rows execute commands as child

Description

execute following undocommands as childs of the previous generated undocommand and not it's parent. In this case the rowCount of the Spreadsheet will be correctly determined, because all columns are already resized when emitRowCountChanged() of the spreadsheet is called. As side effect

Conformity

• Changelog entry
• Unit tests
• Update INSTALL
• Downport
• Fixes: !366 (merged) (Bug in MR)

When external dependencies are removed

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