Update get_date.m : In Octave the action on the netcdf file must be declared....

Update get_date.m : In Octave the action on the netcdf file must be declared. Found by Valentina Iturra (UdeC)

Visualization_tools/get_date.m

@@ -50,7 +50,7 @@ if isempty(Yorig)
   Yorig=nan;
 end
 %
-nc=netcdf(fname);
+nc=netcdf(fname,'r');
 time=nc{'scrum_time'}(tindex);
 if (isempty(time))
   time=nc{'ocean_time'}(tindex);