Dclab

- feat: introduce user-defined temporary features (point 2 in 98)
- fix: catch errors for integrity checks on non-raw datasets (102)
- fix: add check for negative fluorescence values (101)
- enh: add metadata keys for baseline offset (107)
- setup: remove deprecated setup.py test

- fix: add check for zero-flow rate in dclab-verify-dataset
- setup: added new file CREDITS for docs and only use maintainer
in setup.py
- docs: add autodoc to constant variables (94)
- docs: add "features_innate" and "features_loaded" to scripting
goodies section
- ref: cleanup of RTDCBase class
- ref: int/bool deprecation warnings in numpy 1.20.0 (93)
- tests: test for area_cvx as a float, consistent with output from
Shape-In (96)

- fix: TypeError when registering emodulus LUT (91)
- ref: minor cleanup

- build: use oldest-supported-numpy in pyproject.toml

- fix: export trace data in chunks to avoid out-of-memory
errors when compressing large files
- ref: introduce CHUNK_SIZE in write_hdf5.py and use it when
exporting to .rtdc

- enh: dclab-compress now by default does not compress any input
files that are already fully compressed (fully compressed means
that all HDF5 datasets are compressed somehow); to get the old
behavior back (compress in any case, use the "force" keyword
argument)