Table to read. Either a string (the name of a table), or an
integer (the position of the table). If neither argument specifies the
table, defaults to the first table.
strike_action
One of c("exclude", "keep", "star") or c("e", "k", "s"). Should stricken
values in the original .pzfx be excluded, kept or labeled with a trailing "*". If a trailing
"*" is added, the column will be of type character.
date_x
One of c("numeric", "character", "both") or c("n", "c", "b"). Should x column of
format "Date" be handled as numeric (time elapsed from the first time point), character (the date
string encoded by Prism, for example "8-Sep-2008"), or both (leading to two columns).