new gains and gas_opt for seawifs, fixed the assignment of OI4NY and OI4NX to correct sea ice, updated hawkeye L1 reader, limit the size of the get_nc_height cache, modified target_io to use gsl to interpolation
new gains and gas_opt for seawifs, fixed the assignment of OI4NY and OI4NX to correct sea ice, updated hawkeye L1 reader, limit the size of the get_nc_height cache, modified target_io to use gsl to interpolation