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
1 and 2 make sense. Which properties besides `sync_log_id` do you think should remain hidden?
Also I'm not sure exactly what you mean by point 3, could you elaborate a little?