The Users datagrid unit tests now utilize the new expected query helper

functions to build more maintainable sets of query expectations that the

datagrid's queries can be tested against.
All tests now go through a _build_datagrid_equeries(), which manages

all the datagrid query assertions, utilizing these helpers and the

arguments provided to test the datagrid. It's now much easier to

determine how the tests differ and to keep them maintainable as work on

the queries continues.

Unit tests pass.