Options -d and -r added

Also possible race condition removed.

Now printansi can be used as a save logfile, like in

for a
do
	echo "start $a"
	process "$a"
	echo "finished $a: $?"
done |
# Log lines "[YYYYMMDD-HHMMSS][PID] stdin"
printansi -drp "[$$]" -lf logfile.out -