ISWordDocumentBookmark; now exposes content for Summary Table

When using a Document of File Type "Word Document" you may add a bookmark that is replaced by a Word Table.

The preferred method of defining the content of the table is via an ISSummaryTable, using ISWordDocument.SetContentSummaryTable() method. However once the Summary Table is set there is no way of accessing the Summary Table again. This is not normally an issue for custom bookmarks.

However, it means standard bookmarks, such as [Statement.Transactions], do not provide any way of manipulating the Summary Table that is built internally.

Therefore a new property "ContentSummaryTable" has been added to ISWordDocumentBookmark to allow the Summary Table to be accessed and updated if necessary.