v0.5.5: line sparse-read redesign rollout

back to numcodecs==0.15.1, which 0.16.0 cause zarr read error cannot …

…import name cbuffer_sizes from numcodecs.blosc

Update README.md (data source)

ver 0.3.0 Breaking upgrade to GEBCO(2023) now. Change to use pipenv f…

…or package version management

Package upgrade/improve pm2 restart by pre_stop

Run in production (gunicorn with pm2)