Appends data to an open file.
file_append({file_handle}, {data}...)
Open a file, append data to it
hnd = file_open("log.txt"); file_append(hnd, "New data to append");
Append multiple pieces of data
file_append(hnd, "Line 1\n", "Line 2", 100);
file_delete
file_open file_close
file_read
file_append file_flush