Did not really respect the ALL_USERS flag (always acted as if checked)

git-svn-id: https://plugins.svn.wordpress.org/read-and-understood/trunk@1016397 b8457f37-d9ea-0310-8a92-e5e31aec5664
No longer displays SQL statement if no records to be exported

git-svn-id: https://plugins.svn.wordpress.org/read-and-understood/trunk@1016399 b8457f37-d9ea-0310-8a92-e5e31aec5664