Yes delete the paramest package (just check once more that none of the functions are used. I do not recall using anything from there.)
For data importer, I think some of the functions get used to extract the data for the core parameter inference example within the mcmc_simbio package. I think any function that is not used can just be removed. But none of this needs to be documented, because the user will usually provide their own data, and does not particularly care how this data is extracted from the underlying database file.
Goal: finding the files that are not used by the code base anymore.
Action list: