HTML Widgets; Grid control; Columns can now indicate that they should be excluded when exporting the grid's data

Right-clicking on a grid and exporting it's data will, by default, include all visible columns apart from drilldown buttons.

When a column is created, an excludeFromExport: true option can now be specified to prevent the column being exported, e.g.:

gridTest.AddColumnHtml("Test", {caption: "HTML", align: "right", excludeFromExport: true });