Use FreeData property to store CalcCache results

Since GeoDMS version 7.122 data item results are by default not any longer stored persistently in the CalcCache. The default value for the FreeData property is True.

By configuring the FreeData property to false,  data item results, if they meet all other conditions, are stored persistently in the CalcCache. If the property is configured for an item it applies to this item and all it's subitems. 

In general it is advised to store only results that are time consuming to recalculate and that are re-used in the same of in new sessions. This keeps your CalcCache size limited and results might be available fast, as less disk I/O is needed. But it requests some knowlegde on which expressions are time consuming to calculate.

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