- re-introduced support for LiPD objects, including loading, export, and mapping
- rigorous time representation, based on [PaCTS](https://doi.org/10.1029/2019PA003632) proposal
- Gaussian kernel method for coarsening time grids (`gkernel`)
- `filter` method for Series objects
- `common_time` method to put various timeseries on a common timescale, using interpolation, binning or Gaussian kernel
- _MultipleSeries_ methods, including stack plots, correlation, filtering, and PCA
- _EnsembleSeries_ methods, including correlation and plotting
- expanded documentation of data structures (classes)
- various bug fixes