Merge branch '1874-ravel-unravel-index' of github.com:OceanParcels/Parcels into 1874-ravel-unravel-index

Author: fluidnumerics-joe

parcels/field.py

@@ -1349,7 +1349,6 @@ def unravel_index(self, ei):
         xi : int
             The z index.
         """
-
         _ei = ei[self.igrid]
         zi = _ei // (self.grid.xdim * self.grid.ydim)
         _ei = _ei % (self.grid.xdim * self.grid.ydim)