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- Major changes
- grid_ref arguments are dropped in distribute_*
- detect_class is added
- Documentation was revised accordingly

- Remnants of dev codes were removed
- distribute*multirasters is added
- Argument class detection is implemented

- check_bbox no longer accepts numeric reference
- multiraster test

- kernel extraction is fully implemented
- S4 implicit list embedding error fix is pending

- func argument should be explicitly declared (which accepts weights)
- Local test passing confirmed

- Multirasters tests are not detected by codecov?

- sedc calc suddenly failed;
- README.md edited