add optional ContainsHeader property

great we never had this :-(

Change-Id: Id79b08ff9dfe42228ed7d6b27ad0c8cc29b1bfb0
diff --git a/offapi/com/sun/star/sheet/DatabaseRange.idl b/offapi/com/sun/star/sheet/DatabaseRange.idl
index 585fcd3..0c48965 100644
--- a/offapi/com/sun/star/sheet/DatabaseRange.idl
+++ b/offapi/com/sun/star/sheet/DatabaseRange.idl
@@ -118,6 +118,13 @@ published service DatabaseRange
        @since LibreOffice 5.0
     */
    [optional, property] boolean TotalsRow;


    /** specifies whether this range includes a top row of headers.

        @since LibreOffice 5.0
     */
    [optional, property] boolean ContainsHeader;
};