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Remove Poisson chi2 approximations #2171
This PR removes a few functions in gammapy.stats that are chi2 approximations of Poisson data.
I think I added those years ago following http://cxc.harvard.edu/sherpa/statistics/
But I don't think we or users ever used them, and using those stats is pretty dubious. They are completely untested. I'd prefer to remove, as opposed to improve (i.e. add tests and docs).
@registerrier - My concern is to create a clean, well-tested Gammapy v1.0 in the little time we have left and to focus coding / testing / docs effort on that part. I do expect that a lot of functionality will be added in the coming years, such as e.g. this rarely used functionality.