Pypsa

What's Changed
* fix curtailment calculation by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/483
* io: fix netcdf import for datetime snapshots by fneum in https://github.com/PyPSA/PyPSA/pull/484
* doc: add linopy optimisation module API reference by fneum in https://github.com/PyPSA/PyPSA/pull/485
* setup.py: limit linopy version by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/493
* prepare release 0.21.1 by fneum in https://github.com/PyPSA/PyPSA/pull/490


**Full Changelog**: https://github.com/PyPSA/PyPSA/compare/v0.21.0...v0.21.1

What's Changed
* [pre-commit.ci] pre-commit autoupdate by pre-commit-ci in https://github.com/PyPSA/PyPSA/pull/463
* Integrate new optimization module based on linopy by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/336
* [pre-commit.ci] pre-commit autoupdate by pre-commit-ci in https://github.com/PyPSA/PyPSA/pull/464
* Frontend stats by p-glaum in https://github.com/PyPSA/PyPSA/pull/457
* linopf: Allow empty lhs in nodal balance for zero rhs by coroa in https://github.com/PyPSA/PyPSA/pull/465
* optimization: fix postprocessing with different index type by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/471
* fix example model text for pypsa-earth by pz-max in https://github.com/PyPSA/PyPSA/pull/469
* add discord reference by pz-max in https://github.com/PyPSA/PyPSA/pull/468
* Statistics refactor by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/473
* statistics: fix groupby argument by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/474
* User update by pz-max in https://github.com/PyPSA/PyPSA/pull/475
* Restore pandapower importer and add tests by pz-max in https://github.com/PyPSA/PyPSA/pull/332
* statistics: fix groupby default argument by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/476
* io: speed up import by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/480
* prepare release 0.21.0 by fneum in https://github.com/PyPSA/PyPSA/pull/481


**Full Changelog**: https://github.com/PyPSA/PyPSA/compare/v0.20.1...v0.21.0

What's Changed
* minor fix of docstring for define_constraints function by Irieo in https://github.com/PyPSA/PyPSA/pull/426
* set n.objective to nan for failed optimisation (closes 397) by fneum in https://github.com/PyPSA/PyPSA/pull/424
* Add plotting example by energyLS in https://github.com/PyPSA/PyPSA/pull/427
* clustering bugfix: default p_nom should be sum by martacki in https://github.com/PyPSA/PyPSA/pull/430
* [pre-commit.ci] pre-commit autoupdate by pre-commit-ci in https://github.com/PyPSA/PyPSA/pull/432
* [pre-commit.ci] pre-commit autoupdate by pre-commit-ci in https://github.com/PyPSA/PyPSA/pull/441
* minor change to package name by snoyes in https://github.com/PyPSA/PyPSA/pull/439
* allow Path for importing network objects by fneum in https://github.com/PyPSA/PyPSA/pull/443
* Refine network representation by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/440
* Proposed fix to issue 436 by pgkirsch in https://github.com/PyPSA/PyPSA/pull/447
* CI: remove windows run from conda CI by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/449
* add redispatch example by fneum in https://github.com/PyPSA/PyPSA/pull/446
* Aggregation of per unit timeseries of one port components by ClaraBuettner in https://github.com/PyPSA/PyPSA/pull/435
* test: pass explicit axis to colorbar plot by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/451
* [pre-commit.ci] pre-commit autoupdate by pre-commit-ci in https://github.com/PyPSA/PyPSA/pull/450
* add JRC as user by fneum in https://github.com/PyPSA/PyPSA/pull/452
* refactor consistency check, improve performance by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/454
* Update components.py by nnhjy in https://github.com/PyPSA/PyPSA/pull/459
* prepare release 0.20.1 by fneum in https://github.com/PyPSA/PyPSA/pull/460

New Contributors
* Irieo made their first contribution in https://github.com/PyPSA/PyPSA/pull/426
* snoyes made their first contribution in https://github.com/PyPSA/PyPSA/pull/439
* pgkirsch made their first contribution in https://github.com/PyPSA/PyPSA/pull/447
* ClaraBuettner made their first contribution in https://github.com/PyPSA/PyPSA/pull/435
* nnhjy made their first contribution in https://github.com/PyPSA/PyPSA/pull/459

**Full Changelog**: https://github.com/PyPSA/PyPSA/compare/v0.20.0...v0.20.1

What's Changed
* add Python 3.10 to CI, remove Python 3.9 platform restrictions by fneum in https://github.com/PyPSA/PyPSA/pull/387
* Change message when exporting/importing networks, consider networks without a name by euronion in https://github.com/PyPSA/PyPSA/pull/386
* n._multi_invest set to False for networks imported from pypsa<0.18.0 by fneum in https://github.com/PyPSA/PyPSA/pull/389
* remove deprecated distutils module by fneum in https://github.com/PyPSA/PyPSA/pull/391
* Deprecate n.lopf(pyomo=True) default in favour of n.lopf(pyomo=False) by fneum in https://github.com/PyPSA/PyPSA/pull/390
* plot: compute boundaries in all case for consistent circle sizes by fneum in https://github.com/PyPSA/PyPSA/pull/394
* add pypsa.plot.add_legend* utility functions for lines, circles, patches legends by fneum in https://github.com/PyPSA/PyPSA/pull/395
* add support for individually normed colorbars in n.plot() by fneum in https://github.com/PyPSA/PyPSA/pull/396
* fix indexing when iterating over subnetworks components by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/392
* restore compatibility for pyomo 6.4.1 by fneum in https://github.com/PyPSA/PyPSA/pull/406
* Update links.csv by txelldm in https://github.com/PyPSA/PyPSA/pull/404
* add example models using PyPSA by lisazeyen in https://github.com/PyPSA/PyPSA/pull/403
* plot script: fix keyword error in bus sizes by p-glaum in https://github.com/PyPSA/PyPSA/pull/407
* CI: fix deprecations and warnings by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/408
* Disconnected bus: Test added, temporary fix (display in network consi… by Cellophil in https://github.com/PyPSA/PyPSA/pull/393
* Add meta attribute to the pypsa network object by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/413
* [pre-commit.ci] pre-commit autoupdate by pre-commit-ci in https://github.com/PyPSA/PyPSA/pull/414
* networkclustering: greedy modularity maximization by martacki in https://github.com/PyPSA/PyPSA/pull/377
* test: skip pypower test if import fails by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/416
* documentation fixes by fneum in https://github.com/PyPSA/PyPSA/pull/417
* CI: disable windows for python3.7 due to hdf5/netcdf installation fails by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/418
* [pre-commit.ci] pre-commit autoupdate by pre-commit-ci in https://github.com/PyPSA/PyPSA/pull/419
* Add OTH Regensburg to PyPSA users by energyLS in https://github.com/PyPSA/PyPSA/pull/420
* set clustering defaults by martacki in https://github.com/PyPSA/PyPSA/pull/423
* pandas deprecation: set to list when calling .loc[] by martacki in https://github.com/PyPSA/PyPSA/pull/422
* Extend unit tests for components by rockstaedt in https://github.com/PyPSA/PyPSA/pull/421
* prepare release 0.20.0 by fneum in https://github.com/PyPSA/PyPSA/pull/425

New Contributors
* txelldm made their first contribution in https://github.com/PyPSA/PyPSA/pull/404
* Cellophil made their first contribution in https://github.com/PyPSA/PyPSA/pull/393
* energyLS made their first contribution in https://github.com/PyPSA/PyPSA/pull/420

**Full Changelog**: https://github.com/PyPSA/PyPSA/compare/v0.19.3...v0.20.0

What's Changed
* Add pre-commit hooks by euronion in https://github.com/PyPSA/PyPSA/pull/365
* apply pre-commit formats by fneum in https://github.com/PyPSA/PyPSA/pull/375
* doc: fix binder links by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/378
* add scikit-learn to doc environment for spatial clustering example by fneum in https://github.com/PyPSA/PyPSA/pull/384

New Contributors
* pre-commit-ci made their first contribution in https://github.com/PyPSA/PyPSA/pull/379

**Full Changelog**: https://github.com/PyPSA/PyPSA/compare/v0.19.2...v0.19.3

What's Changed
* Fix broken link to pypsa.linopt.join_exprs() method by fwitte in https://github.com/PyPSA/PyPSA/pull/366
* linopt: use .loc for assigning new rows and columns in pd.DataFrame by FabianHofmann in https://github.com/PyPSA/PyPSA/pull/367
* add 750kV line type by p-glaum in https://github.com/PyPSA/PyPSA/pull/369


**Full Changelog**: https://github.com/PyPSA/PyPSA/compare/v0.19.1...v0.19.2