Implement Galametz reddening

[raphaelshirley]

It may be interesting to implement SED dependent galactic reddening as in Galametz 2017

https://www.aanda.org/articles/aa/pdf/2017/02/aa29333-16.pdf

This has been implemented in Phosphorous so might be possible without significant development effort.

https://anaconda.org/astrorama/phosphoros

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[raphaelshirley]

The code would need to take the E(B-V) value for every source as an additional input. It would then apply reddening to each template during the fit of each object.