JuliaStats / GLM.jl / 769

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RFC: Compute working weights and residuals more carefully to reduce underflow (#312)

* Compute working weights and residuals more carefully to reduce underflow
and get the limits right when overflow is unavoidable. To do this, change
inverselink to return μ, 1-μ, dμdη, instead of μ, dμdη, μ*(1-μ) for Link01
in order to have access to accurate μ or 1-μ.

Introduce an absolute tolerance criterion to avoid convergence issues when
deviance is almost zero and rename tol to rtol.

* Adjust compat section of Project.toml

* Fix deprecation

* Tighten test

91 of 91 new or added lines in 3 files covered. (100.0%)

369 of 492 relevant lines covered (75.0%)

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