Fetches the NCA summary from the ubiquity system object.
system_fetch_nca(cfg, analysis_name = "analysis")List with a data frame of the NCA results (NCA_summary), the raw
output from PKNCA (PKNCA_results), and also a list element indicating the
overall success of the function call (isgood)
ubiquity system object
string containing the name of the NCA analysis (default 'analysis')
Vignette on NCA (vignette("NCA", package = "ubiquity"))