Revert "SSP-1372 Eager-load Challenge associations needed by default TO"

This reverts commit bc2ba71224e02318d073855cb3320b07324ec86f.

This optimization just will not work without major changes to the
pagination mechanism.

http://floledermann.blogspot.com/2007/10/solving-hibernate-criterias-distinct.html
SSP-1375 Fix regression which caused page size to be ignored