Nrewebservices

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* Switch from suds-jurko to suds
* Discontinue support for python < 3.5, and add support for python to 3.12

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* Discontinue support for Python 2.6 and 3.3, and officially add support for Python 3.6 & 3.7.
* Update to the 2017-10-01 version of the LDBWS schema. This introduces Formations for services.

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* Convenience properties of board services *origin* and *destination* which provide a single string
suitable for display directly to users, instead of a list of objects.
* Strip whitespace from `via` field.
* Python 3.6 support.
* Break CallingPointList out into an object, as the list itself has properties too.

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* Fresh release due to messing up v0.1.2 upload to PyPI.

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* Fix exception when getting LDBWS WSDL or API KEy from environment variables.
* Fix BoardBase.filter_crs property mapping so it is now correctly populated.
* Fix python 2.6 compatability.
* Extra check in get_[fastest|next]_departures[_with_details] methods to ensure that the
destinations parameter is actually a list.