Show case properties in the "Case History" table of the Case Export page by default

Previously, you had to check the "show advanced and deleted properties" box to see all properties in the case history table. Now, all of those properties will be shown regardless of whether the box is checked or not. (The "Cases" table is unaffected).

Addresses this ticket:
http://manage.dimagi.com/default.asp?123010#695770
If in the `update_table_conf` function we set the `show` property to true for all of the `column_configuration`s in the `"#.actions.#"` block, then I would probably have to hard code the name of that block in that function instead. I think that has more or less the same problem as hard coding it into the template. Maybe there is a better way to identify those column_configurations though?