Setup a nonlinear system for optimization

Usage

.nlmSetupEnv(par, ui, data, modelInfo, control, lower = NULL, upper = NULL)

par: A named vector of initial estimates to setup the nonlinear model solving environment. The names of the parameter should match the names of the model to run (not `THETA[#]` as required in the `modelInfo` argument)
ui: rxode2 ui model
data: rxode2 compatible data for solving/setting up
modelInfo: A list with `predOnly` (predictions-only model in terms of `THETA[#]`/`DV`), `eventTheta` (0/1 per THETA flagging event-related parameters that need Shi2021 finite differences, same length as `par`), and `thetaGrad` (needed when solveType != 1; gives value/gradient per THETA). See `ui$nlmSensModel` or `ui$nlmRxModel` for examples.
control: control structure; required: `rxControl`, `stickyRecalcN`, `maxOdeRecalc`, `odeRecalcFactor`. Optional: `solveType`, `eventType`, `shi21maxFD`, `shiErr`, `optimHessType`, `shi21maxHess`, `hessErr`, `useColor`, `printNcol`, `print`, `normType`, `scaleType`, `scaleCmin`, `scaleCmax`, `scaleTo`, `scaleC`, `gradTo` (default 0 if missing).
lower: lower bounds, will be scaled if present
upper: upper bounds, will be scaled if present

nlm solve environment; key fields: `$par.ini`, `$lower`, `$upper` (all scaled), and `$.ctl` (control structure).

No rxode2 solving should occur between setup calls; prints the solving header if `print != 0`.

Matthew Fidler