make base_theme defaults smaller based on how it looks knitting them with better figure defaults in knitr
update AUC and NCA to properly handle extrapolation to infinity (lm fit should use logtranformed DVs), give additional arguments for which time points to check for terminal phase extrapolation, refactor NCA to have a similar design as AUC functions, and upgrade AUC_inf to optionally return additional relevant info rather than just AUC_inf value for use outside summarize functions