Internal function to load the data from CSV files.
load_csv(rv, keys_to_test, headless = FALSE, system)
A list with data.tables for each unique CSV file as defined in the 'source_system_table' field of the MDR.
A list object. Internal list simulating Shiny's 'reactive values'.
A vector containing the names (keys) of the variables to test.
A boolean (default: FALSE). Indicating, if the function is run only in the console (headless = TRUE) or on a GUI frontend (headless = FALSE).
The system object rv$system