arr_snap: return array laid out in Fortran order

Author: manisandro

sane.py

@@ -316,7 +316,7 @@ def arr_snap(self):
             np = numpy.frombuffer(data, numpy.uint16)
         else:
             raise RuntimeError("Unexpected sample size: %d" % sampleSize)
-        return numpy.reshape(np, (samples, width, height))
+        return numpy.asfortranarray(numpy.reshape(np, (samples, width, height)))
 
     def arr_scan(self):
         """