PEPATACr.R now gives error with upgraded R dependencies

[donaldcampbelljr]

I reinstalled R dependencies using the native install guide within the documentation and PEPATACr.R began giving me an error, possibly due to the upgraded data.table package -> v1.16.0:

Error in forderv(x, by = by, sort = FALSE, retGrp = TRUE) : 
  Column 1 passed to [f]order is type 'list', not yet supported.
Calls: <Anonymous> ... lapply -> FUN -> unique -> unique.data.table -> forderv
Execution halted

I attempted to solve this with a refactor in #289 and while the project level pipeline no longer crashes, I continue to get warnings about row length mismatches. Thus, this requires further investigation.

Using R version 4.1.2 (2021-11-01) -- "Bird Hippie".