convert aaa_load.t to Test::More
consolidate test helper function of form `ok( $no, $result )`

All `ok()` helper functions of the above form are consolidated to
`num_ok( $no, $result )`. This function is in t/lib/TestHelper.pm and is
exported into all files that use it.

Future cleanup will turn `num_ok()` calls into `Test::More::ok($result)`.
done_testing not needed
consolidate more ok() functions from various test files