Fix docstring test in make_diffraction_test_data.py

Add testing of docstrings in make_diffraction_test_data.py and
radial_utils.py. The latter was enabled by toggling show_progessbar
off in the HyperSpy configs via the hyperspy preferences while running
the doctests.

pytest.ini

@@ -1,2 +1,2 @@
 [pytest]
-addopts = --ignore=pyxem/detectors/generic_flat_detector.py --ignore=pyxem/detectors/medipix_256x256.py --ignore=pyxem/detectors/medipix_515x515.py --ignore=pyxem/dummy_data/make_diffraction_test_data.py --ignore pyxem/signals/common_diffraction.py --ignore=pyxem/signals/diffraction2d.py --ignore=pyxem/signals/indexation_results.py --ignore=pyxem/utils/marker_tools.py --ignore=pyxem/utils/radial_utils.py
+addopts = --ignore=pyxem/detectors/generic_flat_detector.py --ignore=pyxem/detectors/medipix_256x256.py --ignore=pyxem/detectors/medipix_515x515.py --ignore pyxem/signals/common_diffraction.py --ignore=pyxem/signals/diffraction2d.py --ignore=pyxem/signals/indexation_results.py --ignore=pyxem/utils/marker_tools.py

pyxem/conftest.py

@@ -11,6 +11,7 @@
 def doctest_setup_teardown(request):
     plt.ioff()
     tmp_dir = TemporaryDirectory()
+    hs.preferences.General.show_progressbar = False
     org_dir = os.getcwd()
     os.chdir(tmp_dir.name)
     yield
@@ -21,7 +22,6 @@ def doctest_setup_teardown(request):
 
 @pytest.fixture(autouse=True)
 def add_np_am(doctest_namespace):
-    hs.preferences.General.nb_progressbar = False
     doctest_namespace["np"] = numpy
     doctest_namespace["hs"] = hs
     doctest_namespace["pxm"] = pxm

pyxem/dummy_data/make_diffraction_test_data.py

@@ -90,7 +90,7 @@ def _get_elliptical_ring(xx, yy, x, y, semi_len0, semi_len1, rotation, lw_r=1):
     Examples
     --------
     >>> from hyperspy.signals import Signal2D
-    >>> from pyxem.dummy_data importmake_diffraction_test_data as mdtd
+    >>> from pyxem.dummy_data import make_diffraction_test_data as mdtd
     >>> s = Signal2D(np.zeros((110, 130)))
     >>> s.axes_manager[0].offset, s.axes_manager[1].offset = -50, -80
     >>> xx, yy = np.meshgrid(