Pywr

New Features

- Allow target flow-duration curves to be supplied in an external file for `FlowDurationDeviationRecorder`. (977)
- Allow only one of upper or lower targets to be specified in `FlowDurationDeviationRecorder`. (977)

Bug Fixes

- Fix bug where event recorders were not registered and could not be loaded from JSON. (976)

Bug Fixes

- Allow loading normalised KDE and `NumpyArrayNormalisedStorageRecorder` recorder from JSON. (974)

New Features

- Added `LossLink` node. (960)
- Added `MultiThresholdIndexParameter`. (969)
- Added two recorders that fit a KDE to time-series of storage volumes. (970, 971)
- Added an optional tags dictionary to `Component` for storing user defined metadata. (968)

Bug Fixes

- Support loading "area" and "level" attributes as parameters correctly. (972)

Miscellaneous

- Added CI support for Python-3.9 on manylinux. (954)

New Features

- Add additional "activation function" parameters: `BinaryStepParameter`, `RectifierParameter` and `LogisticParameter`. (965)

New Features

- Refactor node loading into two stages to solve circular loading problems. (945)
- Add additional `get_all_xxx` methods to core nodes to allow fetching `min_flow`, `max_flow` and `cost`
values for all scenarios simultaneously. (958)

Miscellaneous

- Switch to using Openpyxl for reading and writing Excel files (see changes to Pandas v1.2). (959)
- Dropped support for Python 3.6 following lack of support in upstream libraries (NumPy and Pandas). (959)

New Features

- Add optional `exclude_months` to `AnnualCountIndexThresholdRecorder`. (950)
- Update load methods of interpolation parameters so that they accept `interp_kwargs`. (943)
- Allow `InterpolateVolumeParameter` to use external data. (926)
- Added `NumpyArrayNodeCostRecorder` to recorder a timeseries of a node's cost attribute. (932)
- Added `to_dataframe()` method to `AnnualCountIndexThresholdRecorder` and `AnnualTotalFlowRecorder`. (939)

Bug Fixes

- Fixed a bug with `RbfProfileParameter` where it did not pass `rbf_kwargs` to the RBF functions. (946)
- Fixes to save and draw graph functions to improve handling virtual and child nodes. (938)

Documentation

- Updated installation docs. (931)
- Add missing parameters (`FlowParameter` and `DiscountFactorParameter`) to API docs. (934)

Miscellaneous

- Migrate continuous integration system from Travis and Appveyor to Github Actions. (948, 951, 952, 953)
- Removed deprecated `PiecewiseLinearControlCurve`. (947)
- Apply some PEP8 compliance fixes. (929)
- Remove use of `basestring` which was only needed for Python 2. (928)