Automate the input_params and output tables

[kdorheim]

This idea mainly relates to the vignettes/articles/output.Rmd file where the table in the article has to be made manually with the scripts/R_output.R. However, with #656 we should be able to make this table using the fxntable that was created for the getfxn capabilities it would require that we have a script that generates an up-to-date data-raw/input_params.csv.

Possible steps

1. Add a script that produces data-raw/input_params.csv perhaps scraping from the information from an ini file this would replace the data-raw/dave-input-params.R
2. Modify the lookup-data.R scrip so that the units column has NAs were not applicable
3. vignettes/articles/output.Rmd script should use the fxntable subset to not include inputs or functions associated with NA units. Then make the pretty R output table
4. delete scripts/R_outputs.R

[bpbond]

I assume this is not for v3? Added milestone.