Pywr

New Features

- Hash checking is now *not* case-sensitive. (1046)
- Add `MonthlyVirtualStorage` node that resets after a given number of months.
- Add `StorageParameter` that provides the current volume from a storage node.
- Add support for running multiple Pywr models in an interleaved fashion using a new `MultiModel` class
and associated parameters.

Bug Fixes

- Update load method of several parameters (`ControlCurveInterpolatedParameter`, `ControlCurveParameter`,
`ArrayIndexedScenarioMonthlyFactorsParameter`, several interpolated parameters) to ensure all data
is loaded. (1048)

Bug Fixes

- Fix a bug where the solver specified using a keyword to `Model.load` would be ignored. (1044)

Miscellaneous

- Release wheels for Python 3.9 (Windows) and Python 3.10 (Linux and Windows).

New Features

- Networks with missing connections will now more reliably raise `ModelStructureError`. (1025)
- Improve GLPK API (1021):
- GLPK errors are now handled by default by raising `GLPKInternalError`.
- NaN checks are performed by default.
- Added runtime option to use "unsafe" API with no error or NaN handling (see new documentation).
- Added documentation describing error handling changes.
- Improve handling of NaN values in `Storage.current_pc` (i.e. when `max_volume` is zero).
- Added a new method `Storage.get_current_pc` to guarantee a finite value.
- Added `min_output` to `RectifierParameter`

Miscellaneous

- Documentation improvements:
- `RiverSplitWithGauge` docstring. (1030)
- Added section describing how to use Dataframe checksums. (1028)
- Added `ControlCurveParameter` to API docs. (1027)

Bug Fixes

- Fix internal node names for `PiecewiseLink`. (1024)

New Features

- Supply `initial_volume_pc` in `VirtualStorage` and its subclasses. (1015)
- Add `residual_days` option to `UniformDrawdownProfileParameter`. (1013)

Bug Fixes

- Fix a JSON formatting error in the documentation. (1009)
- Removed a circular import in `pywr.recorders.calibration`. (1012)

Miscellaneous

- Removed some older folders related to Travis. (1016)
- Re-formatted the Python code using the Black formatter and enforced this for future modifications. (1010)