HyP3 autoRIFT v0.6.3

Changed

• Applied some minor error estimate fixes and netCDF metadata attribute updates as
  described in the vendored software README.md
• process.get_lc2_metadata() now attempts to fetch STAC metadata from the
  https://landsatlook.usgs.gov/ API and falls back the STAC json in the S3 bucket

Removed

• hyp3_autorift.process and the associated autorift_proc_pair entrypoint no longer
  accept the band argument, which wasn't being used.