Collects all lines, (for example containing splits or relay swimmers) associated with a particular performance into a data frame with the appropriate row number for that performance.
lines_sort(x, min_row = minimum_row)a list of character strings including performances, with row numbers
added by add_row_numbers
the lowest row number
a data frame with Row_Numb as the first column. Other columns
are performance elements, like splits or relay swimmers, both in order of
occurrence left to right