nsiccha

I've implemented nested, ordered and (hopefully) thread safe(er) progress bars for a project I'm working on ([example code](https://github.com/nsiccha/WarmupHMC.jl/blob/4ef52e50866e34dbcfea416bbfb5f35e01e0df4b/docs/progress.jl), [most of the relevant implementation](https://github.com/nsiccha/WarmupHMC.jl/blob/4ef52e50866e34dbcfea416bbfb5f35e01e0df4b/ext/TermExt.jl). It shows up to a fixed number...

FR: Allow UDFs to vary only in `data` annotations

6

Currently, defining the same function with the two signatures which are identical except for data annotations does not work (Stan will error during compilation with "Function '[...]' has already been...