Fix a few problems with accessing the POLCOMS data due to the new way it's stored in the pc struct. Also change the way the depth values are interpolated (onto the sigma layers rather than sigma levels
Fix a few problems with accessing the POLCOMS data due to the new way it's stored in the pc struct. Also change the way the depth values are interpolated (onto the sigma layers rather than sigma levels

pwcazenave/fvcom-toolbox,pwcazenave/fvcom-toolbox