docs/whatsnew/v0-4-4.rst from oemof/oemof-solph

docs/whatsnew/v0-4-4.rst
Summary

Maintainability

Test Coverage

Issues
v0.4.4 (June 1st, 2021)
-----------------------


API changes
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* Allow conversion factor of zero for `GenericTransformer`
* Python 3.6 is no longer officially supported. It may still work for a while though.


New components/constraints
##########################

* Custom component: oemof.solph.custom.PiecewiseLinearTransformer. A transformer model with one input and one output and an arbitrary piecewise linear conversion function. On how to use the component, refer to the `test script <https://github.com/oemof/oemof-solph/blob/dev/tests/test_scripts/test_solph/test_piecewiselineartransformer/test_piecewiselineartransformer.py>`_.
* Enhanced custom SinkDSM:
    * Renamed keyword argument `method` to `approach`
    * Renamed approaches `interval` to `oemof` and `delay` to `DIW`
    * Added modeling approach `DLR` (PhD thesis of Hans Christian Gils 2015)
    * Included load shedding
    * Introduced `recovery_time` in `DIW` approach
    * Introduced `shift_time` and other parameters for `DLR` approach
    * Included investments in DSM
    * Normalized keyword arguments `demand`, `capapcity_up` and `capacity_down`

Bug fixes
#########

* Check number of `Flow` s in `GenericStorage`

Other changes
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* Split code into submodules
* Move CI-Tests from Travis to github (see `PR #746 <https://github.com/oemof/oemof-solph/pull/746>`_)

Contributors
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* Jann Launer
* Johannes Kochems
* Patrik Schönfeldt
* Stefan Schirmeister
* Uwe Krien