Mesotrione data and vignette

The vignette illustrates pH dependent degradation (covariate modelling)
with some detail for the parent compound.

Also, a bug in the saem method of the illparms function was fixed, which
prevented to find ill-defined parameters in cases where e.g. slopes of
covariate models have a negative estimate.

1 files changed, 10 insertions, 10 deletions

diff --git a/tests/testthat/_snaps/plot/mixed-model-fit-for-nlme-object.svg b/tests/testthat/_snaps/plot/mixed-model-fit-for-nlme-object.svg
index 76fed0dc..c94012ce 100644
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