Chained logistic regression

I was wondering if there were plans to add the possibility to run multiple logistic regressions with different missingness patterns with one call to the function, as was done for linreg (http://discuss.hail.is/t/feature-chained-linear-regression/726), or if there would be no gain for logistic regressions in comparison to performing these regressions sequentially.

We can definitely do that. Issue tracked here: https://github.com/hail-is/hail/issues/4682