Update get_section.m - In Octave the action on the netcdf file must be...

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

Visualization_tools/get_section.m

@@ -190,7 +190,7 @@ latdata=latdata(mask==1);
 %
 %  Get the vertical levels
 %
-nc=netcdf(gname);
+nc=netcdf(gname,'r');
 h=nc{'h'}(:);
 hmin=min(min(h));
 h=h(jmin:jmax,imin:imax);
@@ -200,7 +200,7 @@ h=h(mask==1);
 %h=mean(h)+coef*(h-mean(h));
 h=griddata(londata,latdata,h,lonsec,latsec,interp_type);
 %
-nc=netcdf(fname);
+nc=netcdf(fname,'r');
 %
 % First reset h for morphodynamics cases
 %