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Spreadsheet: convert PropertySheet to link type property
PropertySheet is changed to derive from PropertyExpressionContainer, which makes it a link type property that is capable of external linking. It now relies on the unified link property API to manage object depenency, and tracking of object life time, relabeling, etc. This patch also includes various fix and improvement of Spreadsheet, such as improved recompute efficiency, correct handling of document label change, etc.
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