Update radial.py to include "none" as an option for rhef (#266)

Co-authored-by: Nabil Freij <[email protected]>

changelog/266.breaking.rst

@@ -0,0 +1 @@
+Changed the default rank method for `sunkit_image.radial.rhef` from 'numpy' to 'scipy'.

changelog/266.feature.rst

@@ -0,0 +1 @@
+Added a method called "none" to `sunkit_image.radial.rhef` to allow for the bypassing of the radial filter.

sunkit_image/radial.py

@@ -118,15 +118,20 @@ def _percentile_ranks_numpy_inplace(arr):
         arr[sorted_indices] = np.arange(1, len(arr) + 1)
         return arr / float(len(arr))
 
-    # Select the sort method
+    def _pass_without_filtering(arr):
+        return arr
+
+    method = method.lower()
     if method == "inplace":
         ranking_func = _percentile_ranks_numpy_inplace
     elif method == "numpy":
         ranking_func = _percentile_ranks_numpy
     elif method == "scipy":
         ranking_func = _percentile_ranks_scipy
+    elif method == "none":
+        ranking_func = _pass_without_filtering
     else:
-        msg = f"{method} is invalid. Allowed values are 'inplace', 'numpy', 'scipy'"
+        msg = f"{method} is invalid. Allowed values are 'inplace', 'numpy', 'scipy', or 'none'"
         raise NotImplementedError(msg)
     return ranking_func
 
@@ -651,7 +656,7 @@ def rhef(
     radial_bin_edges=None,
     application_radius=0 * u.R_sun,
     upsilon=0.35,
-    method="numpy",
+    method="scipy",
     vignette=None,
     progress=False,
     fill=np.nan,