MAGIC FITS data

[cdeil]

I just found this:

• http://vobs.magic.pic.es/
• http://vobs.magic.pic.es/fits/
• http://vobs.magic.pic.es/fits/mfits/tdas/tdas-fits.pdf

I don't have time to look now. We should at least:

• check if their data formats for spectra and lightcurves are useful to adopt (see https://gammapy.readthedocs.org/en/latest/dataformats/index.html)
• check if their data is interesting enough so that it makes sense to add a dataset fetch function

[cdeil]

Closing this old issue now, not in scope for Gammapy. For data collection there is now https://gamma-cat.readthedocs.io/ and also the joint-crab paper will provide some example data from MAGIC and other IACTs.