Pygaia

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- Test cases slightly updated

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- Added constant AU expressed in mas*km*yr/s

- Fixed large memoery consumption in the _getJacobian method in the coordinate transformation code.
Thanks to `jchelly <https://github.com/jchelly>`_ for pointing out this problem.

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- Add method to CoordinateTransformation for the transformation of the full (5x5) covariance matrix of
the astrometric parameters.

- Add keyword to astrometric errors prediction functions that allows to specify an extended mission
lifetime.

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- Bug fix in coordinate transformation code.

- Updated photometry and radial velocity error predictions.

- End-of-mission photometry errors, including calibration floor, introduced for the broad band fluxes.

- Photometry errors now include 20% margin for CCD-transit and end-of-mission predictions.

- Example plot of photometry errors fixed.

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- Added numerical constants.

- Improved setup.py, made code compatible with Python3

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- Minor error in documentation of astrometryToPhaseSpace() method corrected.