Numpy tests site manager.

    Usage:
      >>> NumpyTest(<package>).test(level=1,verbosity=1)

    <package> is package name or its module object.

    Package is supposed to contain a directory tests/
    with test_*.py files where * refers to the names of submodules.

    test_*.py files are supposed to define a classes, derived
    from NumpyTestCase or unittest.TestCase, with methods having
    names starting with test or bench or check.

    And that is it! No need to implement test or test_suite functions
    in each .py file.

    Also old styled test_suite(level=1) hooks are supported but
    soon to be removed.