BF: apparently dicom wrappers still do not have affine property, reverting

See PR in nibabel to RF for this:
  nipy/nibabel#796

Author: yarikoptic

src/dcmstack/dcmmeta.py

@@ -1533,7 +1533,7 @@ def from_dicom_wrapper(klass, dcm_wrp, meta_dict=None):
         data = dcm_wrp.get_data()
 
         #The Nifti patient space flips the x and y directions
-        affine = np.dot(np.diag([-1., -1., 1., 1.]), dcm_wrp.affine)
+        affine = np.dot(np.diag([-1., -1., 1., 1.]), dcm_wrp.get_affine())
 
         #Make 2D data 3D
         if len(data.shape) == 2:

test/test_dcmmeta.py

@@ -1143,7 +1143,7 @@ def test_from_dicom():
     nw = dcmmeta.NiftiWrapper.from_dicom(src_dcm, meta)
     hdr = nw.nii_img.header
     eq_(nw.nii_img.shape, (192, 192, 1))
-    ok_(np.allclose(np.dot(np.diag([-1., -1., 1., 1.]), src_dw.affine),
+    ok_(np.allclose(np.dot(np.diag([-1., -1., 1., 1.]), src_dw.get_affine()),
                     nw.nii_img.affine)
        )
     eq_(hdr.get_xyzt_units(), ('mm', 'sec'))