swim_parse_splashCollects relay swimmers as a data frame within swim_parse_splash
collect_relay_swimmers_splash(x, relay_indent = Indent_Length)returns a data frame of relay swimmers and the associated performance row number
output from read_results followed by add_row_numbers
the number of spaces relay swimmer lines are indented compared to regular swimmer lines
collect_relay_swimmers_data runs inside of
  swim_parse_splash