TST: Tighten test of generic Ufunc loops.

The previous assertion tested was ``assert_almost_equal`` which has two
major drawbacks:

* ``assert_almost_equal`` does not handle floating point values
consistently, however many of the test compare floating point results.
As recommended in the docs test has changed to use ``assert_allclose``
which provides better floating point comparisons.

* It fails to check if the expected dtypes are returned. Currently the
tests check how *close* the resultant numbers are to one another, not,
if the dtypes are the same. The updated tests explicitly compare dtypes

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