new gains and gas_opt for seawifs, fixed the assignment of OI4NY and OI4NX to correct sea ice, install_ocssw tar files with relative path, updated hawkeye L1 reader, limit the size of the get_nc_height cache, updated dtdb for l2bin and l3mapgen, modified target_io to use gsl to interpolation, l0info_pace now reads oci data without CFE header