Pysenal

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* add :code:`format_time`

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* add :code:`get_jsonline_chunk_lazy` and :code:`get_jsonline_chunk`

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* Make methods available by :code:`import pysenal`

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* Fix check logic in :code:`index`

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* Fix bug in :code:`json_serialize`

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New Features
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* add :code:`serialize_method` in jsonline write methods
* add :code:`json_serialize` method to help json dumps