- base & view model for imread

- transforms bugfix
- implement (nan)var and (nan)std
- add tests

tests/test_ufuncs.py

@@ -0,0 +1,18 @@
+import pytest
+import numpy as np
+from ndbioimage import Imread
+from itertools import product
+
+
+r = np.random.randint(0, 255, (64, 64, 2, 3, 4))
+im = Imread(r)
+a = np.array(im)
+
+
+@pytest.mark.parametrize('fun_and_axis', product(
+    (np.sum, np.nansum, np.min, np.nanmin, np.max, np.nanmax, np.argmin, np.argmax,
+     np.mean, np.nanmean, np.var, np.nanvar, np.std, np.nanstd), (None, 0, 1, 2, 3, 4)))
+def test_ufuncs(fun_and_axis):
+    fun, axis = fun_and_axis
+    assert np.all(np.isclose(fun(im, axis), fun(a, axis))), \
+        f'function {fun.__name__} over axis {axis} does not give the correct result'