consider mutiple type of event counts in input data AE/PD/Queries

[erblast]

To save computation time it should be possible to have multiple event columns (e.g. AEs, PD) in the input data and get under-over reporting probabilities for each of them.

the user needs to provide a vector with the column names in addition to the input data frame

it should work for the following inputs:

aerep <-simaerep(
    tbl_visit,
    r =**r / tbl_r # needs to work for in database and in memory**,
    inframe = TRUE,
    visit_med75 = **FALSE/TRUE**,
    mult_corr = **FALSE/TRUE**
)

running simaerep for multiple event columns should be faster than running simaerep multiple times for one column