Creates a binary matrix showing which students are present in which school years (based on ADECE ID).
Examples
if (FALSE) { # \dontrun{
panel <- student_bind_years(clean_list = list(c1, c2, c3, c4))
track <- student_track(panel)
# Count students present in all years
sum(rowSums(track[, -1]) == length(panel$years))
} # }