SIENA / SIENAX unit tests

Based on FSL course usage - not previously included, as the SIENA commands are labelled with "Do not run", as they take too long to do in the course session

EddyHigh_b_Test/EddyHigh_b_Feeds.py

@@ -31,10 +31,10 @@ class EddyHigh_b_FeedsType(object):
 
         # Compare images and create statistics of differences
         try:
-            mask = self._mask.get_data().astype(float)
+            mask = self._mask.get_fdata()
             mask = (mask > 0).astype(float)
-            corrdiff = self._corr.get_data().astype(float)
-            corrdiff = abs(corrdiff - self._precomp_corr.get_data().astype(float))
+            corrdiff = self._corr.get_fdata()
+            corrdiff = abs(corrdiff - self._precomp_corr.get_fdata())
 
             self._corrdiffmeans = np.zeros(corrdiff.shape[3])
             for vol in range(0, corrdiff.shape[3]):
@@ -131,4 +131,4 @@ def main(argv):
 
 
 if __name__ == "__main__":
-    main(sys.argv)
\ No newline at end of file
+    main(sys.argv)