Allow specifying configuration to spin in header for better integration with RStudio

[krlmlr]

The command "File/Compile notebook" offers compiling with spin() but doesn't allow to set options. As the integrated preview feature is very nice, it would be great if the spin() parameters could be specified. Perhaps look for first lines formatted like:

# format: Rmd

This is not strictly necessary now, but might be relevant later if implementing a Pandoc chain:

.R -> .Rmd -> .md ->(pandoc) ...

Parameters to spin() should override these settings.

[yihui]

The rmarkdown package supports rendering output from an R script using spin() and pandoc (also supported in the RStudio IDE). Perhaps that will satisfy your demand.

[github-actions]

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