Linz-geodetic

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* Adding Sinex.py
* Improving docs
* Adding option for returning multiple solutions
* More Sinex.py updates!
* Fixing bug in ITRF transformation calculation

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* Fixing name of ellipsoid entry point

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* Fixing capitalisation in setup file

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* Tidying up ITRF module

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* More fixes of class case to be a bit more consistent

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* Renaming LINZ.geodetic to LINZ.Geodetic