Energyquantified

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**Improvements**

- Implement ``EventsAPI`` for streaming events from Energy Quantified's
WebSocket API (push feed).
- Add timezone conversion.
- Add ``threshold`` parameter to define how many values are allowed to be
missing while performing an aggregation.

**Dependencies**

- Add ``websocket-client`` v1.5.1
- Upgrade ``requests`` to minimum 2.31 due to security fixes

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**Bugfixes**

- Fixed a bug introduced in v0.10 in ``PeriodSeries.to_timeseries()``

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**Improvements**

- Add areas ``IS`` and ``LU``
- Update borders:
- Set ``SI – HU`` and ``SI – HU`` as Flow-based
- Increase rate limits.
- Increase default request timeout.
- Add option to include ``proxies`` in ``EnergyQuantified`` and ``RealtoConnection``.
- Add support for using periods installed capacity instead of values when
converting a ``PeriodSeries`` to a ``Timeseries`` or a ``DataFrame``.


**Bugfixes**

- Fixed an error where SRMC responses failed to parse empty lists in the response

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**Improvements**

- Improve ``Border.__hash__``, ``Border.__eq__`` and ``Border.__ne__`` methods
- Add new areas:
- ``MA`` Morocco
- ``LY`` Libya
- ``DZ`` Algeria
- Add new border:
- ``SI – HU`` Flow-based
- Borders that no longer has commercial capacity:
- ``LV – RU``
- ``FI – RU``
- ``LT – RU_KGD``
- Borders that have changed to flow-based:
- ``AT – SI``
- ``HR – HU``
- ``CZ – DE``
- ``CZ – PL``
- ``HU – SK``
- ``PL – SK``
- ``PL – DE``
- ``CZ – SK``
- ``HU – RO``
- Border updated to flowed-based and explicit:
- ``SI – HR``

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**Bugfixes**

- When invoking ``timeseries.to_dataframe(single_level_header=True)`` the
resulting column index was still a ``MultiIndex`` but with a single level.
Now the resulting column index is a normal ``Index`` type.

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**Dependencies**

- ``requests``: Use the latest v2.x available, as requests is very stable library.
- ``python-dateutil``: Use the latest v2.8.x available.