Fix test failure due to round-off issues.

Author: pavoljuhas

diffpy/Structure/tests/TestLattice.py

@@ -60,7 +60,7 @@ def test___init__(self):
         self.assertTrue(numpy.array_equal(L0.isotropicunit, L2.isotropicunit))
         L3 = Lattice(*L0.abcABG(), baserot=L0.baserot)
         self.assertTrue(numpy.allclose(L0.base, L3.base))
-        self.assertTrue(numpy.array_equal(L0.isotropicunit, L3.isotropicunit))
+        self.assertTrue(numpy.allclose(L0.isotropicunit, L3.isotropicunit))
         return