Remove slice info in title for Spanwise computed field
Remove slice info in title for Spanwise computed field

The title in spins_plot2d will not include a slice (typically
Y=Ly/2) if the field had a spanwise computation applied to it.
That is, Mean, SD, or Scaled SD fields will only say 'Spanwise
... fieldname, t=...'.

ddeepwel/SPINSmatlab