a profile field existed in the db always passed because it used quickArray in
scalar context. Since quickArray always returns 1 element, this was always true
and it never returned undef like it was supposed to.
To fix this, I added a new method called quickScalar that returns the first column
from the row as a scalar. It has a basic test in SQL.t.
Then there's the new test in User.t for coverage that exposed this problem, and
I also removed a whole slew of duplicate tests.
