Updated matlab script contact.m

[arango]

• The Matlab script, contact.m, used to computed the nesting contact points NetCDF file was corrected for idealized grids. We needed to add the uniform field to the refined grid structure R in the refine_coordinates and refinement functions.

  R.uniform   = G(dg).uniform;
  ...
  R.uniform   = [];
  

• Update Land/Sea masking tool editmask.m to allow working in idealized Cartesian grids without coastline in terms of (lon,lat) coordinates.