Lenstronomy

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* non-linear solver for 4 point sources updated
* new lens models added
* updated Workflow module
* implemented differential extinction

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* faster fft convolutions
* re-design of multi-plane lensing module
* re-design of plotting module
* nested samplers implemented
* Workflow module with added features

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* psf_construction simplified
* parameter handling for catalogue modelling improved

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* PSF numerics improved and redundancies removed.

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* New design of Numerics module
* New design of PSF and Data module
* New design of multi-band fitting module

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* New design of Likelihood module
* Updated design of FittingSequence
* Exponential Shapelets implemented