Fix spread sheet view destruction
In spreadsheetManager
, when we destruct the spreadsheetView pointer, the "main spreadsheet view"
still appear in the list of "views" (ProxyManager().GetProxiesInGroup("views")
in the python console).
In some case, this induces the use of a pointer to the wrong `spreadSheetView in applogic.
We solved that issue by using the objectbuilder destroy method.
Edited by Jerome Dias