Moved PhpUnit test "support" files into their own folder.
Passing a blank page now generates an URL to the "site root".
This is supported by zen_href_link (catalog) and zen_atalog_href_link (admin).
Refactored to run PHPUnit tests in isolation mode.
Added tests for "SEFU" generation.
Added tests for zen_catalog_href_link (admin).
Updated to run "SEFU" for catalog URL generation from the admin.