Dclab

- enh: allow editing S3 credentials via environment variables at runtime
- docs: fix typo in S3 section (missing `DCLAB_S3_SECRET_ACCESS_KEY`)
- docs: add more example use cases in the basin section
- docs: add example script for rewriting paths of basins
- docs: remove broken reference to HDF5 `linker` module
- tests: reduce test time by 35% from 400s to 250 (smaller S3 reference data)

- fix: support opening files on non-mounted network shares on Windows

- fix: exporting table data broken
- ref: introduce base class for tables `TableMeta`

- ref: add custom table class for `hdf5` and `dcor` formats

- fix: viscosity computation for MP-PBS at zero flow rate should be NaN

- enh: support plain `numpy.array` tables